I used to have a berlin classic and then a berlin turbo which occasionally pumped bubbles back into my sump and then into the display tank. I added a valve to the air intake so that I can throttle back the air. This helped to reduce the amount of air entering the skimmer and reduced bubbles coming out of the skimmer.
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--Allan
Current Tank Info: 90 Gal Reef w/ 8x54 watts T-5, 30 Gal Sump/Fuge, 20 Gal FOWLR
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