I have a 500g setup right now and have done a little reading about the mbu puffers. My tank is 8x4x2 with 100g sump and 5500gph pump. Will this be ok for life? I read anywhere from 20"-36" max size, what can I realistically expect? I also saw they can grow a foot in the first year which is good cuz in the tank now are a RTCxTSN and a gar. Neither are aggressive at all. Sand substrate and a couple amazon swords pretty bare tank. So do they need brackish water? Are they aggressive toward tank mates? I've heard all kinda of stuff. Last, they eat snails and stuff? Are we talking like pond snails? Trapdoor snails? I know it changes depending on size, but there are def pond snails in the tank. Thanks for any input or advice!