Okay, you're right. There in a 55. This is my wife's tank and she got these against my advice. The first few days there was some tail slapping, but after that they seem to get along just fine. I am a little nervous about tension building up as they grow, though. I have a friend with a large, very under stocked, tank that will be glad to take them when that day comes. As for now, they are very clean, fat, and healthy. Thanks for not beating me up and the comment about the corals.