I have a 150 reef. I believe the two overflows handle 600 gph. I have heard that if the return pump is too big, it can cause mirco bubbles in the tank. I am in the process of redoing the sump with unders and overs to help get rid of those but should I go to a lower output return pump. I have two Tunze Turbelle pumps in the tank that really push some water. I want to have hard coral but the micro bubbles kill them. Right now I have a Rio 26HF that is doing 1350gph at 4 ft. and I have no control over the return pump speed. Any ideas?
Thanks,
David
Thanks,
David