Yes take the butti back and tell him to get a book on cichlids and do him some reading. That fish is way too agressive for your stock and will kill everything in there in time.
if it makes you feel better, i dont think there is very many other cichlids that could take a butti of that size, and chances are if they really bought it to fight other fish they probably couldnt get the fish that could to a large enough size anyway.One of my fav fish, I had several and the biggest being a tad over 18" mean as hell, one fish only in tank, but he gently ate food out of my hand, like an idiot, I got rid of him. I traded him into a lfs, the day I left it there some dude came in a bought it, told me he was looking for a fish to fight with his friends, so I guess this is what ended up with my old butter![]()