That Fish Blog – Aquarium Advice and Information

Your reef tank may be immaculate except for a rusty-brown dusting of diatomic algae on your substrate. Tired of siphoning just to have the diatoms come right back? Relatively inexpensive and highly efficient, a sand-sifting sea cucumber may be the solution you’re seeking.

There are many species of sea cucumber available in the aquarium hobby. They get their name from their elongated, cylindrical body shape. Some are colorful, some are not, some are smooth, while others appear knobby or textured. Some are filter feeders that cling to the glass, waiting for food to come to them in the water flow. There are three specific types of sand sifters that are commonly offered which do a really great job cleaning up your sand. All of them belong to the genus Holothuria and they are very efficient at what they do.  Read More »

It is a calm day on the Amazon River. Two men are fishing in their small wooden boat. As one casts his line, he slips and falls into the water. Instantly, the surface of the water begins to roil and boil with action as a school of flesh-eating piranhas begins to do their nastiest work on the unfortunate fisherman. Minutes later, there is nothing left as the piranhas have eaten their fill. That is the myth. Aggressive and voracious schools of shiny silver and red fish with razor sharp teeth ready to devour anything that touches the water. So how true is that myth? We’ll be talking about the common Red-belly today, and some more commonly seen piranha in my next blogs.  Read More »

A few hundred years ago, people in Western cultures like 16th century England often drank very little water. Because of untreated sewage draining into water sources and contamination in rivers, other beverages like beer and wine were actually preferred as safer choices. As technology and our understanding of health and technology advanced, we came up with more ways to purify our water sources. At the start of the start of the 19th century, a scientist named William Cumberland Cruikshank found that chlorine would purify water by killing microbes and bacteria like the notorious E. coli. Chlorine is still used in most developed countries to make drinking water safe and chloramine, a combination of chlorine and ammonia is starting to overtake even this old standard. Read More »

This week I would like to take a look at another annoying pest in the reef tank, the zoanthid eating nudibranch.  The zoanthid eating nudibranch is much like the soft coral eating nudibranch in both body shape and difficulty to find and eliminate.  The zoanthid eaters usually belongs to the famliy Aeolidia.  They are built much the same as the soft coral eating nudibranch, with cerata or finger-like growths that grow on their dorsal side.  These growths allow them to blend with the zoanthids, making them difficult to see as they feed on your polyps.  These nudis are usually small, ranging in size from 1 millimeter to 1 centimeter in length, which also makes them very difficult to detect and remove from polyp colonies.  They tend to hang on to the underside of the polyp and remain hidden.  Read More »

Rules, rules, rules, why do we have to follow rules?  Well, for the most part, because they are for your own good.  Kind of like going to the dentist.   However, some rules should not last forever.  Sometimes they‘re no longer relevant, sometimes a better idea comes along, and sometimes they turn out to be bad ideas to begin with.  This is true in just about any facet of life, and aquarium keeping is no different.  I could rant about several rules that come to mind, but my rule of the moment is the old “Watts per gallon” rule when it comes to choosing lights for your aquarium, particularly live plant and reef aquariums, which require higher intensity lighting. Read More »