Ok, here's the deal. My neighbor has 3 GSP in the same tank. Not sure about he size, my BF was telling me. Anyway he told me she has them in freshwater and is wondering why they keep dying on her. He told her ohh....my girlfriend would be yelling at you keeping them in freshwater lol. Anyway, can any of you tell me what to tell her about their needs? I have no idea about brackish stuff, how to tell the salinity of the water, what salt to use, what salinity they need, what they should be eating, if they can even be kept together. Anybody know any of this stuff?