I just bought a mala a few days ago. It's about 5 inches. In my tank I have a 10 in Midas, 10 in Jag, a 7 in red tiger mota, a 7 in freddy, and a 6 in grammode all currently in a 100 g growout. I've heard the mala is aggressive, but so are all of my other fish. I have a 75 g tank that has goldfish and am thinking of trading these in. Should I put the mala alone in the 75? I really wanted to put him in a community setting, but don't want it to kill my other fish either... Anybody ever keep these in a community setting? I was really hoping too, but maybe this is wishful thinking. LOL.