08-09-2010, 08:13 PM
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If you read our profile of the Red Tailed Shark [click on the shaded fish name, or use the second tab from the left in the blue bar across the top], you will note that this fish attains 6+ inches and should not be in anything less than a 4-foot tank. And on its own, and other bottom fish must be selected carefully as many will be seen as rivals. Particularly as the fish matures, which was a good point someone mentioned. Also, they have a nasty disposition toward striped fish many times, for some reason.
And while it is always possible that some specimens may not show their true colours, so to speak, the fact remains that nature has created this species a certain way with natural instincts and behaviour traits. As the fish grows things change; if it grows (or more accurately attempts to grow) in too small an environment, things can get much worse. The stress caused to the fish by being in too small an aquarium--and this does cause considerable stress to fish, as science is now proving--also wears down the immune system making it more susceptible to disease and health problems.
So, to kimpossible and your idea of getting a shark for a 29g tank--if you have plans for a 4-foot tank in the very near future, fine; the shark can manage in a 29g for the short-term, but not long.