I have a 58 Oceanic RR tank. Pump is a Mag 5. I use a 20H for a sump filled about 3/4 full. I am getting micro bubbles coming from my return. I use a filter sock in my sump so I know that the bubbles are not being created in the sump and sent to the display. I thought that maybe it was my pump so I ordered a 2nd pump (Via Aqua) and I get the same tiny micro bubbles as with the Mag 5. Where could they be coming from?