its for a 72 bow reef tank
I have a Rio 20HF in there now I think its a little to powerful what do you guys recommend
also I have some micro bubbles I cant get rid of....
You really want to turn your tank over as much as possible so I would say your fine your bubbles are they coming from the over flows and sturing the sump water the pump is pumping. You may need to put a baffle in there to seperate the water so pump gets no bubbles. I run a mag 18 & mag 7 for returns I needed to get the overflow water away from the pumps to make sure there are no bubbles.
Right now I am using a Rio 1700, but have a new quietone 3000 on order. I plan to add a T with a ball valve to the return line. that way if it is to much flow I can reduce it without blocking up the pump