Im getting a 75g this Sunday and want to make it a piranha tank. What do you 75g-80g owners have in your tanks. I plan on running either to aqua clear 500's or emporor 400's. Been in the fish hobby for many years and this is my first piranha tank. Currently have a 58g reef tank and no freshwater tanks. Also I am going to paint the back of the tank black, what kind of paint do I use.