well i just got a baby CK (about 2 maybe a little smaller) from my lfs. The tank they had him in also had a 4inch vampire tetra that looks like it was beating on him a little, so other than a few scratches he seems fine, he is in a 10gallon atm (with a 3inch senegal and a 3 1/2 inch tire-track eel) and will soon be moved in a 90 gallon. yes i know he can and probably will get big so i am prepared to by a bigger tank when the time comes.