hello, I have 4 RBP in a 90 gallon. They are two years old, all about 7 inches. Is there any solid breeding advice piranha breeders can give me? From what I have observed, three of the four are wider and slightly bigger, which could mean female, the one is slightly smaller and thinner, which supposedly means male. I have tried lowering water level, used a spray bar to create a rain effect, done a slightly cooler water change. I'm going to try peat soon but will it actually work? I really want these fish to breed, I've gotten several easier types of fish to breed before but I'd love some experience with my red bellies. Thanks in advance