I was just curious what you guys are using for water pumps? I have seen Ihiem and maxi-jet. The maxi-jet seem to be whats called a powerhead pump. I assume you can use a powerhead. They see fairly cheap and my buddy owns a pet store. I want to make sure I can use a power head. Please advise me water coolers! Plus is 240+gph overkill? Seems like at that speed the water wont lose the heat through the radiator because it will move through so fast.