Just completed and installed a closed loop system on my non-drilled 72 gallon bowfront. It's being driven by a little giant 3mdx-sc pump and is running through a scwd and output through 3/4 in cpvd and 3/4 in lockline fittings. Everything appears to be working correctly and there aren't any leaks that I can see. Unfortunately I'm getting a large amount of micro bubbles. Anybody have any clues what might be causing them?