I have two of these: http://www.americanaquariumproducts.com/images/graphics/hydrospongethree.jpg
Two of these:http://leesaqpet.com/component/virtuemart/?page=shop.product_details&flypage=flypage.tpl&product_id=209&category_id=6&keyword=box+filter
and two top fin XP air pumps for 55 gallon...
