Okay, I just got my rr 90 up and running. I have an AGA 90 rr. I have a 20 gal sump, with 1 inch drain to sump. My return is all 3/4 inch driven by a Pan World 150PS. I realize my sump must be too small, but my flow is so fast I cant seem to totally reduce my bubbles. I have a very fine...