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Aquarium Slime: What is it and what to do about it?

“Slime algae” is a common problem with aquarists of all levels but getting rid of it can be tricky. The name “slime algae” is a misnomer and what may looks like a slime in your tank could be a number of different problems or, more commonly, a symptom of a number of different problems. The key to getting rid of it is to identify and eliminate the cause rather than just treating the symptom.

As with most aquarium problems, diagnosing this problem starts with testing your water quality. Water tests are just like vital signs at a doctor’s office and can point to or eliminate a lot of different problems in an aquarium. In addition to the four core water tests – Ammonia,Nitrite, Nitrate, and pH – testing the Phosphate level is also important in algae and algae-like issues like this. We’ll go into more detail later with how each parameter may be causing your problem and how they can be used to solve it.

Next, take a look at the “slime” itself…we’ll use these different appearances to help narrow down which you might be seeing in your tank. What color is the algae – red, green, black, brown, white? What is the texture like – thick and mat-like, a thin coating, wispy, cloudy? Do you notice it growing anywhere particular on the tank – only on the substrate or a certain ornament, in a circulation deadspot, only towards the top? Can it be easily brushed away? Are there bubbles forming beneath it?

Now to the different “slimes”…


Red Cyanobacteria in saltwater tank

Thick and mat-like, usually dark red (especially in saltwater) or dark green (especially in freshwater). Bubbles form underneath the mats and it is easy to brush off of surfaces.

This is the most common “slime algae” that aquarists encounter but it isn’t actually an algae at all even though it may behave like one. This is Cyanobacteria (often simply called “cyano”). Cyanobacteria are bacteria that manufacture their own food and live in colonies — large enough for you to see them! It’s these colonies that cause trouble for aquarists. They are not necessarily blue-green but can be black, green, blue green, and the familiar dark red sheets covering many surfaces in an aquarium.

The first thing aquarists who find an unwanted colony of cyanobacteria in their aquarium want to know is how to get rid of it. Well, this is where it gets tricky. To eradicate the problem, the particular trigger for the cyano bloom must be identified and treated. Not every bloom is in response to the same trigger and while throwing a chemical at the problem will perhaps clear it up temporarily, it will come back, and it will be worse. Cyano has a few common causes:

  • High Nitrates (NO3-)/Dissolved Organic Carbon (DOC): These two parameters go hand-in-hand and are often interchangeable for an aquarist’s purposes. Nitrate and DOC is a food source of the bacterial side of the bacteria-algae. Sources include: fish slime, algae, bacteria, digested/uneaten food, metabolic waste, live food, some aquarium additives etc.
    • Key Appearance: The cyano with this cause will grow fairly indiscriminately anywhere in the tank where it gets light. This is usually the thickest mats of cyano.
    • Solution: This is best done by frequent water changes, good water movement (power heads and closed system circulation ) and (this is important!) a good protein skimmer (for saltwater tanks only). An undersized or ineffective protein skimmer, high waste loads, or a combination thereof will increase the dissolved carbon level. As a rule of thumb for skimmers; buy one that is rated for at least twice the size of your tank. It may take some adjusting but a properly functioning skimmer can remove ½ cup of thick organic scum from a tank a day. Also, watch what you feed. Feed once a day. If you wish to feed twice, simply split the amount in half – don’t feed twice as much food. If you feed grocery store bought seafood or are making your own foods, rinse all foods thoroughly as seafood sold for human consumption is treated with phosphates and preservatives to keep it fresher longer. (It’s true!) Avoid flake foods, these dissolve too fast – pellets and crisps are much better and more palatable.
  • High Phosphates (PO43-): This level is similar to the Nitrates above and may come from some of the same sources. It is used as a preservative in some foods as mentioned, but is usually the result of the water source. If you are using tap water, be sure to test the water before adding it to your tank, especially if it is well water or if you are in an area with a lot of agriculture and run-off. You can also check with your municipality if you use a municipal or “city” water source since Phosphate may not be removed in all areas.
    • Key Appearance: Similar to above.
    • Solution: Frequent water changes with Phosphate-free water. If your water source already has high Phosphate levels before it even makes it to your tank, consider installing an RO/DI (Reverse Osmosis/Deionization) Unit . This filtering system removes all impurities (including Phosphate, Nitrate, and DOC). If you already have an RO/DI Unit, make sure all the membranes are installed correctly and changed regularly. If you aren’t able to install your own unit, many stores like ours sell RO/DI water by the gallon. Filter medias are also available to help remove Phosphates faster than water changes alone.
  • Lighting:The food source for the algal side of the bacteria-algae is light. This is becoming less common as LED lighting is replacing older fluorescent aquarium lighting but if you are still using fluorescent bulbs, check on the age of your bulbs. Light bulb spectra (the “color” of the light) shift as they age, resulting more favorable conditions for photosynthesis to take place more vigorously. Older bulbs become more yellow in color and the “good” plants and algae can’t use this spectrum as well as the “bad” algae and cyano can.
    • Key Appearance: If lighting is the cause, you are most likely to see the cyano forming in the most brightly-lit areas of the tank with the most direct light. Since light wave penetrate differently through the water column, you may see a gradient in the cyano growth from top to bottom.
    • Solution: Replace old bulbs. If your fluorescent bulbs are older than 6-8 months, it is time to replace them. Even if they still “look” bright, the color will have started degrading. If you are able to, consider switching to an LED fixture. In addition to being much more energy efficient, they don’t age and lose their spectrum in the same way fluorescent bulbs will.
  • Poor Circulation: In this case, you may see cyano in only certain areas of the tank like corners or areas sheltered by rockwork. In these areas, the circulation is blocked or can’t reach sufficiently and any waste can build up before it can be removed by the filter. This provides a captive food source for the cyano.
    • Solution: Rearrange your tank or install powerheads or pumps to increase the circulation. Consider upgrading your filter as well if it isn’t powerful enough for the tank size.

Green Cyanobacteria in freshwater tank

Thin and wispy sheets, usually on the substrate and especially in freshwater tanks. Usually green, brown, or blue-green

Trick question! This is also Cyano. This appearance is more common in freshwater tanks and in higher-flow environments where the Cyano can’t settle into thick mats. The same causes and solutions above still apply.

It should also be mentioned that there are chemicals to “treat” Cyano. Cyano is a gram negative (thin cell membrane) bacteria, much like most bacteria in the aquatic environment. A dose of Erythromycin will knock out the colony of slime quite quickly and this is the active ingredient in most Cyano chemicals on the market. However, since the nitrifying bacteria you need in your tank are gram negative as well, they will be affected also, either being killed or severely damaged. This treatment is more advisable in freshwater aquaria, but only with careful attention paid to water quality while treating. Like all antibiotics, if dosed frequently the cyano will develop a resistance. This should be a short-term fix only, and the problem leading to the cyano bloom in the first place still has to be addressed to eliminate it for good.


Diatom Algae in new tank

Thin light brown coating on exposed surfaces, especially in new aquariums (less than 4-6 weeks) or in tanks that have recently been “restarted” with a large water change (over 40-50%), medication, or other event

A few weeks after the tank has started cycling (after live rock, fish or a bacteria culture has been added), you may see a thin brown film covering the surfaces and sides of the tank. This film scrapes or wipes off easily and cutting back lighting doesn’t seem to affect it. No snails, hermit crabs or fish feed on it, but critters moving across the substrate or glass tend to stir it up enough so it “goes away.” So, what is going on at this point?

The “algae” you see is not a type of plant with cells like traditional green algae that most people think of. It is actually made up of diatoms, a type of phytoplankton whose cell walls are primarily made up of the mineral silicate. It blooms towards the end of the cycling process in a tank because of the imbalance of nutrients in the system but will usually die off on its own once the water chemistry in the tank stabilizes. This is what we commonly refer to as “New Tank Syndrome” (NTS).

  • Solution: Just wait! As tricky as it may be, the best tool to combat NTS is patience. Once the cycle progresses and the tank becomes established, this diatom bloom will exhaust itself and fade away on its own. You can clean the sides of the tank and stir up the substrate to break up the algae, but avoid the temptation to do water changes or add any algacides at this point….this will only cause the cycle to take even longer to finish and the NTS will keep coming back. Most tanks take about 4-8 weeks to cycle, depending on the bioload and size of the tank.
  • For more information, see our article Explaining the Nitrogen Cycle.

Fungus on driftwood

White, mold-like coating often isolated to a single ornament (especially natural ornaments like driftwood) in a freshwater tank

This is usually a sign of fungus or decomposition. If the “slime” is translucent in appearance, it is more likely to be a fungal growth. This is common on ornaments that may have been left outside and exposed to airborne spores, or on pieces washed with some detergents. If possible, remove the piece from the aquarium and scrub it thoroughly in a bucket of tank water or under warm running water. Spider Wood especially is notorious for becoming moldy when first added to a tank but will usually dissipate on its own in time.

If the “slime” is more opaque in color and easily brushes away, something is decomposing. If this is a natural material like a once-dried-out starfish or another animal, dispose of it…it will only continue to decompose and harm the water quality. If it is a harder object like a piece of wood, you can try cleaning it like described above but if it continues to soften or fall apart, it likely just isn’t a safe type of wood and should be replaced as well.

These are just a few of the most common “slime”-related issues we encounter often but are far from everything you may experience. We have come across some really unusual circumstances that have turned out to be related to something as seemingly unconnected as an oil-diffuser air freshener in an outlet near the tank. Feel free to let us know if you need help troubleshooting with your own tank!

Originally published September 9, 2008. Updated May 13, 2020.

Introduction to Freshwater Shrimp II

Welcome back Patty Little Back with profiles on two more types of freshwater shrimp you may find interesting and consider adding to a peaceful community tank. These are species that we commonly carry in the retail store.

Cherry Shrimp
Cherry ShrimpCherry Shrimp, Neocaridina heteropoda, are named for their deep red, speckled coloration. They originated from Northeast Asia and this is not their color in the wild; they have been selectively bred to enhance the reds. Their natural coloration is reddish brown to brown to help them blend to their environment. Cherry Shrimp are common, colorful, cheap, and hardy. They are an ideal beginner shrimp as they may survive in conditions that many shrimp will not tolerate.
Cherry Shrimp thrive in a wide array of conditions. Ph from 6.0-8.0, soft or hard, temps from 72-84 will be tolerated with ease. They will eat about anything from flake and pellet to fresh and frozen offerings like spinach, spirulina, bloodworms and a variety of other offerings, but though healthy specimens will attack food with vigor, they do not need to be offered food every day. Overfeeding can cause health issues and fowl the water.
Cherry Shrimp only grow to be about an inch in length. Males are easily distinguished from females as they are significantly smaller and have less intense coloration. A small colony of 5 or 6 shrimp will give you good odds of having both sexes. These shrimp are known to be quite prolific and will breed regularly and produce fry which can be raised easily under good conditions and as long as no fish are present. Mature females will show a yellow-green “saddle”, which are actually eggs developing in her ovaries. The fertilized eggs are carried by the female under the tail for 2-4 weeks until the young shrimp hatch and disperse. The tiny shrimp babies are identical versions of the parents. Colonies of these shrimp are easy to establish and small species set-ups can be ideal to really get to know these fascinating little guys! Image referenced from Wikipedia Commons, http://upload.wikimedia.org/wikipedia/commons/1/13/Two_red_cherry_shrimp.jpg

Bamboo Shrimp
There are several different types of filter feeding shrimp that are available in the aquarium trade. One of the coolest, I think, is the Bamboo Shrimp, aka Fan Shrimp, Wood Shrimp, Asian Filter Shrimp, Mountain Shrimp, and Singapore Shrimp. This species, Atyopsis moluccensis, is quite attractive and bold in a predator free tank, a worthwhile addition though they can be a little pricey. They grow to 2.5-4 inches in length and at that size they can easily become a centerpiece member of your aquarium community. They are safe for docile tankmates despite their large size, as they are filter feeders.
Bamboo Shrimp occur in a varying range of colors, but are typically some shade of red, tan, or brown. A cream colored to yellow stripe runs down the center of the shrimp’s back, and thinner stripes line the flanks. The most appealing physical characteristic of these shrimp are the fan-like filtering appendages they use to collect food. The fine filaments open to collect tiny bits of food (as opposed to claws like most shrimp) which are swiped through the shrimp’s jaws. Feeding requires that the shrimp is able to sit in an area of current, so some keepers suggest that wood or some other furniture is placed in an area of moderate flow so the shrimp has a good place to perch and feed. Periodic feedings of liquid invert foods may be appreciated, but in great moderation so water quality does not decline.
Bamboo shrimp can live for several years under good conditions. They prefer Ph between 6.5 and 7.5, temps between 72 and 82F. These shrimp need specific conditions to breed and reproduction with this species is not something that will occur in a freshwater aquarium as the larvae need varying degrees of salinity as they mature before returning to freshwater as mature specimens. This species is captivating and if given the right conditions can be a real conversation piece for aquarists. A large planted tank with plenty of flow will be prime real estate.
I hope to blog on some other less common freshwater shrimp in the next installment of this series, tune in again!
Patty

An Invasive Species Account: Purple Loosestrife

Please welcome back Brandon Moyer with another entry on invasive speciesPurple Loosestrife

The next species I would like to present to you in my exploration of invasive species is one that is notorious among biologists across the country. Though it is quite beautiful in bloom, it is known as a super invasive plant species that disrupts habitats and displaces many native species of fish as well as insects, birds, and other small mammals.

The species is Lythrum salicaria, and it may be something you see every day without even knowing it.  It is known by over ten common names including spiked loosestrife and purple lythrum worldwide, but is best known by the name Purple Loosestrife in the United States. Purple Loosestrife was first introduced into North America through several different vectors; as an ornamental plant for ponds and gardens, as an herb used in cooking and medicine, and through ship ballast water. The origin of Purple Loosestrife is unknown, although its current range is vast. It is very hardy, has spread across Asia and Europe, only limited by the extreme cold of the upper northern hemisphere.

Purple Loosestrife spreads in two ways. One adult plant (4+ years of age) can produce over two million seeds in a single season. These seeds tend to float which aids in dispersal. Their rhizomes, commonly known as runners, can grow up to a foot a season. New plants can spring from these rhizomes, which compounds the number of seeds produced each season.

In several biology and ecology courses I had taken at Millersville University, L. salicaria was a popular example of an introduced species that has taken a strong foothold in a new environment. The dense clusters of roots and rhizomes choke out the roots of other plants around the loosestrife, increasing the area in which it can spread and smothering native plants. Their leaves decompose in the fall when the weather begins to cool and detritivore activity decreases, leading to nutrification of infested waterways. Its thick undergrowth deprives native animals like turtles of areas to bask, but is not dense enough to protect other animals from predation.

Today you can see purple loosestrife almost anywhere you see water in the eastern United States including bogs and drainage areas around warehouses and malls. It can be found in every state except for Florida, Hawaii, and Alaska. Conventional methods of eradicating the invasive, including herbicides and burning, are ineffective. One interesting method of control, considered biological control, is introducing other non-native species that prey on the invasive species. In the case of Purple Loosestrife, leaf beetles, root boring weevils, and flower and seed eating weevils have all been introduced to help stop the spread of the weed.
In any case, control is necessary to protect the complex ecosystems of the wetlands that Purple Loosestrife dominates.  You can help by first learning to identify loosestrife, then using methods to control the spread of this invasive species if you find it on your property by digging, pulling, spot spraying or cutting the plants while they are in bloom and before they seed, usually June-Early August.  Remove the plants and cuttings in plastic bags so they degrade, or incinerate the remains of the plants in a contained area.  It is not recommended that they be composted.  Also, avoid certain cultivars of garden loosestrife and their seed, though they may not be invasive varieties, many may be able to cross pollinate with the invasive species.

For more information on Loosestrife visit the following sites:
http://www.invasive.org/eastern/biocontrol/11PurpleLoosestrife.html
http://www.npwrc.usgs.gov/resource/plants/loosstrf/index.htm
http://dnr.wi.gov/invasiveS/fact/loose2.htm
http://www.seagrant.umn.edu/ais/purpleloosestrife_info

Image referenced from Wikipedia http://en.wikipedia.org/wiki/Image:Purple_loosestrife2.jpg, first posted by Megger and used under the GNU Free Documentation License

Thanks Brandon,

Until Next Time,

Dave

 

TFP 700 Gallon Reef Tank

Hi, Dave here, I thought that I would do some blogs about some of the things that I have been working on here at TFP. I will start with one of my projects that I have been working on this year, the remodeling of our Custom Design Center in our retail store. The Custom Design Center is our showcase of aquarium displays. We originally set up the displays about four years ago, and it is time to give them some updating and upgrading. The first tank that we decided to give a facelift is the centerpiece of this display, our 700 gallon in-wall aquarium. Originally set up as a FOWLR (Fish Only With Live Rock, for you non reefers) and a few soft corals, we decided that our centerpiece should be a full blown reef. Putting this display together has been a blast, we really took our time with thinking out the design, and the components to the tank, then over a period of a couple months earlier this year we got the tank up and running just prior to our annual anniversary sale this past April. Those of you who made the trip out here this year got to see the tank after it had been running for about two weeks. We had a good starting point, as we tore down the original tank, and several small reef displays in the store, keeping all the cured live rock and some of the corals, fish, and Inverts for the new tank.

The Tank

The tank itself is a custom 700 gallon Oceanic that measures 120”x 36”x36”. As with all the large custom Oceanic tanks, it has a powder coated stainless steel frame, an ABS, HDPE and glass laminate bottom for extra strength, and ¾” glass panels. Ours has two rear overflow boxes, as well as 4 holes in the bottom panel for a closed loop flow system (I will cover this more in the filtration section) As you can probably guess this is a very heavy tank, I think its dry shipping weight was about 2,200 lbs when crated. Not something that you and your buddies are going to muscle into place, all moving was done with a forklift.

Lighting
700 Gallon Reef Tank Lighting From Above
Knowing we wanted to set up an SPS dominated reef tank that was 36” deep, proper lighting was going to be something that we needed to take care of. The guys at Ice Cap, Inc. really stepped up and helped us make sure that our lighting was top notch, and would allow us to keep whatever we wanted. We chose the new Ice Cap 400w HQI pendant lights, the tank has six of these, and the tank also has six 39 watt HO T5 actinics. All these are powered by Ice Cap electronic ballasts.

As you can see in the pictures, there are three openings in the top of the tank, each opening has two 400w halides and two HO T5 actinics. Each set is hinged above the tank on a hinged rack system that I designed, that allows you to flip the lights up a section at a time to work on that area of the tank. This works really well, it allows you to leave the other 700 Gallon Reef Tank at That Fish Place Lights Downsets of lights on so that you can see in the section that you are working on. On a tank that is 10’ long, that you need a ladder to look into the tank, this comes in handy.

Filtration

There are several parts to the filtration system on the aquarium. There is a Custom Trigger systems sump and protein skimmer, a closed loop circulation system, and a 60 gallon refugium/frag/quarantine tank.
The custom Trigger Systems filtration system that we had custom made for the filtration room that is behind the aquarium is a beast. The sump measures 60”x28”x20”, one end has 4 built in filter socks. 700 Gallon Reef Tank at That Fish Place Protein SkimmerThe protein skimmer recirculates on this section, so it has a constant supply of raw surface water. Then there are a series of baffles, an open center section, another series of baffles, and then a third section where the return pump draws water from. The protein skimmer is also a custom Trigger Systems design that is matched to the sump. It is a dual Beckett injector design that is 10” in diameter, and 44” tall, it works great, lots of thick dense foam. The skimmer is run by a Sequence Marlin pump, and the system return pump is a Sequence Hammerhead.

700 Gallon Reef Tank at That Fish Place Closed LoopThe Closed Loop system sits underneath the aquarium. There are four holes drilled into the bottom of the aquarium, one serves at the drain that feeds the pump, the other three are returns that circulate the return water throughout the live rock structure in the tank. The closed loop pump is another Sequence Hammerhead pump that puts out about 5,000 gph. Each return in the tank splits into four lock-line modular pipe sections with nozzles, which allowed us to direct flow wherever we want it. This is all hidden inside the rock work in the tank, it is hard to see any of it at all.

There is also a 60 gallon cube plumbed into the system that is used for a refugium and frag tank. This has a deep sand bed with a lot of live rock rubble on the surface, we also use this tank to house new fish before they are introduced into the aquarium.
There is also a one horsepower ESU chiller and an 80watt AQUA UV sterilizer that are plumbed into the system. The chiller, sterilizer, and refugium are all fed water from the main circulation pump.

Live Rock and Livestock

700 Gallon Reef Tank at That Fish Place RefugiumThe tank has about 1,000 pounds of live rock, that is a mixture of several types of Tonga and Fiji rock. We tried to use as many really large rocks as possible, several are 70 – 80 lbs each. The live rock was strategically placed to hide as much of the closed loop system as possible, and at the same time leave a lot of open space to give it a more natural appearance. I really wanted to avoid the wall-of-rock look that so many aquariums have.

One of the other things that I really wanted to do with this aquarium was to use as much cultured coral as possible, and limit the amount of wild coral went into the aquarium. This meant sacrificing size for the initial specimens in most cases, but I felt it was important to promote aquacultured and maricultured corals where possible. Of the over 70 corals that are currently in the aquarium, over 50 of them are from a cultured or captive source. Looking at the tank it does not look like there are that many corals in there, mostly because they are all fairly small at this point.

700 Gallon Reef Tank at That Fish Place CoralI will try to post some more pictures of the tank as time goes on, so that you can see the corals as they grow and fill in. This was another reason that I left so much open space in the aquarium when we did the rock work, I wanted to make sure that the corals had plenty of space to grow.
There are a few more tanks that we will be reworking in the custom design center here over the next couple months, I will post some blogs about them as they are completed. I hope that you found this interesting, let me know and I can do more blogs of this type in the future.

Until next time,
Dave

Botia striata : The Smart Snail Solution

Please welcome Craig Beauchamp to That Fish Blog. Craig’s another of our fish room experts. He’s been Craig Beauchampinvolved with the retail fish trade since 1996, and served as Director of Freshwater Fish at top stores in Atlanta and San Diego. His interests and expertise lie in both Old World and New World Cichlids, tropical planted tanks, and marine reef aquaria. He’s been an aquatics supervisor at TFP since 2007.

With the rise in popularity of tropical planted aquariums, people are also beginning to look for new solutions to aid in snail prevention and eradication. Since many of the snail killing products on the market today contain copper, they are not a wise choice to use in planted aquariums because of the sensitivity of those plants to copper. That leaves aquarists with two choices : mechanical or biological snail control. Mechanical control consists of trapping the snails with a jar that contains a leaf of lettuce. The jar is placed in the tank at night and removed in the morning. Another mechanical solution is physically removing the individual snails by hand. One can see that neither of these methods offer complete control. Biological control involves using snail eating fish to remove the snails from your tank. This is often the best and most efficient way to remove snails in any tank.

Botia striataWhile many people look to the clown loach ( Chromobotia macracanthus) to help rid their tanks of pesky snail populations, there are several small species of Botia that are perhaps a better, smarter solution for tanks under 150 gallons. Botia striata is one of these species. While the clown loach reaches a size of nearly 40 cm (16 in.) the modest zebra loach only attains a size of around 10cm (4in.) A curious and attractive addition to your tank, the zebra loach has the typical torpedo – shaped body of most botia. They are yellow in color with diagonal black striations. The zebra loach hails from clear mountain streams in India, where it lives in shoals of several individuals and feeds on crustaceans, insect larvae, worms, and soft plant material. Botia striata are relatively undemanding fish to keep in a home aquarium. Although they prefer softer water, they tolerate a wide range of pH vaues (6.5 to 8.0) and can also tolerate temperatures from 75 F to 82 F, so long as the temperature is stable. Like most botia, the zebra loach does benefit from higher oxygen levels in the water. Performing small weekly water changes of 10% to 20% and placing an airstone in the aquarium will provide plenty of oxygen. Weekly water changes will also keep your dissolved organic levels down to a minimum. This will be appreciated greatly by all residents of the aquarium, especially any botia or loach.

Zebra loaches, since they live in shoals in their natural habitats, love the company of their own kind. A small group of 3 or more is recommended, although a male and a female will live together in relative bliss. Females tend to be more robust and heavier of body than their slimmer, more streamlined male counterparts. A pair or small group of these fish will work diligently to remove any unwanted snail from your aquarium. Supplemental feedings with algae wafers, sinking pelleted foods, and frozen shrimp will round out their diet nicely.

The size and peaceful nature of Botia striata make them an ideal choice for any community aquarium. It is their small size, combined with the gregarious and calm nature of the fish, that makes it an obvious choice for anyone wanting to rid their tank of snails. With proper care and feeding, Botia striata will live for up to 15 years and provide you with a wonderful and hardy addition to your community aquarium.

Thanks for the article Craig,

Until Next Time,

Dave