I have a question that i just thought of, im running a mag 24 as my return pump. it Y's off to supply both sides of my tank since i have two over flow boxes. being that my the top of my tank is six feet above finished floor ive cut my gph down to 1700 gph per mag specs. however my question is do i cut that in half again since im splitting the flow? if yes than shouldnt i be able to increase my return pump for a greater gph? im not saying that i need to as this setup has been running for a year and a half, but if i wanted more flow and not more unsightly koralina power heads i could just upgrade my return pump. btw i do like the power heads but they arent the most attractive thing in my tank ;)