Ok heres the thing, I recently received a 55 gal tank as a gift. It came with everything, or atleast I think. 2 filters, 1 heater, and an air pump. Is there anything else I need? I have had small tanks before but nothing major. Do you guys have any ideas of what I can put in this tank? Something that would not be tooo difficult for a beginner. THanks for all your help!!