I had both these piranha, for about 5 years, love them all, I started as a begginer when I bought them, takes some time to get use to all of the cleaning, after getting use to that, I think you will appreciate them alot more, do not go in thinking there killing machines they are very passive when not being fed. But do not, and I repeat do not underestamate them, at any time, very sharp teeth and quick reflects, do not go very well in a small tank that involves your hand arranging the tank(stupid experence). Especially the Rhom, evil little bastard.