ok, last tank, want an 8-10 foot long tank, 250g+. I have read the article and do not want the "lake cichlids" meaning the ones that i have to have big poweheads for and to overtock for agression. In this tank I am thinking, oscars, severums, convicts, frontosa, ura, and some other big cichlids. Filtration will be 2x canisters and a few large sponges with tile for substrate. this early planning as i am gonna try to find a CL deal. just wondering if you can mix these types of cichlids