Hi guys I am new to saltwater. I set up my sump with where water goes into sump is the protein skimmer (euroreef100). I then have three baffle walls (7.5 inches, next 1 inch from bottom, last is 7.25 inches) they are spaced out 1.5 inches. Next is the refuge which is 7-8 inches from 7.25 inch wall to the last wall which is 7 inches. Then is my return pump section (quiet one 4000). I am getting microbubbles like crazy when I turn ball valve on return line all the way open. I have a eshop 1000 overflow which keeps up with pump. The sump is a 20 gallon long aquarium. I have two separate pvc coming from overflow. I need to get rid of these bubbles so I can run my pump all the way open so I can have a turnover of about 10x per hour. I have a 65 gallon display tank.