Reducing microbubbles from HOB skimmer

Hey all,

I have a CPR bakpak HOB skimmer that, after much trial and error, I've finally got pulling out a decent amount of dark skimmate, however, it also spills microbubbles into the tank. I have a small dense sponge on the overflow that limits the bubbles quite a bit, but there are still more than I would like and was wondering if anyone had any suggestions for an easy fix.

Thanks,
 
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