I dont know what i i can get for my 55g tank. Right now i hve some fish in it but they are not active as i would ike them to be. I have: 1 Molly, 3 Sowrdtails, 3 Guppies, 2 Glassfish, and 1 Pleco. After they all die(of age) i would like to get more active fish. I have a Penguin 330 on it. What fish do you recomand? I want it to be a community fish tank with a veriaty of fish in it.