Ok so my aunt had a columbian shark in her 30 gallon tank for NINE years!!! When she first got him I told her that it would probably die because (I thought the tank was WAY too small). But surprisely EGOR had lived for NINE years!! But he passed away 3 years ago, but the very next day she goes out and buys another one and its been in there for about 3 years now. I'm just wondering could I get one of this in my 55 gallon tank? Egor was probably around 9 inches long and was a heavy little bugger by the looks of him, and her new shark is probably 5inches right now.