What filter should i get for my non planted tank with 1SwOrDtAiL(2in.), 1gUpPy(1.5in.), 2GlAsSfIsH(3in.), 3mOlLiEs(2.5in.), 3rArE fIsH i ThInK tHeY aRe CaLlEd GuPpY LiVeBeArEr(3/4in.), 2 pLeCo(12in.) AnD SwOrDtAiL fRy and a new arival of fry fish. In the far future i will maybe get rainbow fish. the filters are either AC 300, AC 500, Emp. 280, or Emp. 400. I dont want to get the one that does more filterration. all i want is a filter that will keep up with my 55g tank and will keep my water clear. it doent have to be crystal clear.