i have a 11" clown knife in a 75 gal and i know that ill have to move up to a bigger tank. but theres another at my lfs thats a similar size if not a little bigger but he's been there for so long in a tank that he cant even swim forwards backwards or turn around. its 30bucks. i wonder if it would be resonable to buy him or just as well for me in the long run to just sadly forget him