My feeling is when that times comes he can either get a bigger tank or get rid of the fish that have gotten to big. He got lots of time before they ever get to big. He said all his fish are little guys right now. Non of those fish are going to get that big in his tank. Like I said if they can get along is all I'd be worried about. Those fish mentioned can eat smaller fish.Carefree_Dude;4975302; said:IMO, the problem here isn't the "Room", but how many fish he has that can get bigger than the tank. florida gar and pangassius have been known to get 3 feet long. clown knives, 4 feet long.