I just started a 90 gal. everyting looked good except the skimmer was getting any water in it and after seeing a leak in the bottom of my CPR wet/dry filter, I had to shut it down,emptythe sump, tighten the bulkhead and start again. when I cranked it back up the skimmer ha bubbles in it, but the flow into the filter box was too low. Also the main problem was lots of tiny bubbles coming out of the pump and hose leading back into the tank. How do I fix this?