o and i got mine from a LFS that sold him a half dozen times before and people would bring him back after he killed their fish.
THat snakehead in your avatar is freakin AMAZINNNGmy LFS has a massive (w/d/h) 7 x 7 x 2.5 ft display tank and the butti gets on fine in there with other fish only because of the size... in anything smaller it was killing everything ... its probably 12" at the moment.
They are incredibly territorial and more than capable of killing most cichlids with their huge mouths and teeth. Wouldnt advise putting it in a community unless you have a very large tank.