I had gigantic oscars. hehe... they were about 7-8 inches long and mean as s***. Heck I think 2 of them formed an alliance because they beat up on the other 2 really bad. One ended up committing suicide (jumped out of the tank in the middle of the night.... yes, there was a lid on it too) And then they basically ate the scales off of the other one... mean little ba*****s. Fun to watch though. If you put your hand flat above the tank about 2 or 3 inches out they would jump up and try to bite the flat part of your hand... Then we went on vacation over spring break and turned down the heat in the house... well we forgot to put the heaters back in the tanks and they died. Sad day. :-(