Well I have a 125g tank that Im just setting up as we speak. Its going to house 3 Pacus that are only about 4" right now (moving them from a smaller tank) and one 7" pleco. I have a sand substrate and fake plants and was wondering if I could put any smaller fish in there for color without over stocking the tank. maybe some schoolong fish. I know a 125 is still small for 3 Pacus but I have a home lined up for them when they out grow this tank.