01-01-2011, 05:32 PM
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I agree with what's been posted here. You can find more info in our fish profiles, second tab from the left in the blue bar at the top, or click on the fish name when it is shaded in posts, example Red Tailed Shark. Their aggression level can vary, but as they mature it is extended to any bottom fish so the Shark should be the sole substrate level fish in the tank unless it is very, very large. It is believed by scientists that in their habitat they were loners (living in isolation except when spawning); they are now extinct in the wild, sadly.
Your comment on fish in stores: in store tanks, fish are often crowded very severely, but they are not meant to be long in that environment. Their conditions probably cause them considerable stress, and this weakens the immune system and can cause various internal health problems as well as making them much more likely to contract disease and parasites. The stress of the fish in the crowded store tank can prevent them from exhibiting aggression [which is not at all a good thing as the aggression is natural and when suppressed by poor environmental conditions it further damages the fish]. Placed in a more suitable environment, the fish's true tendencies/traits will (or should if healthy) emerge.