Tunze 9002 Nano DOC Skimmer Micro Bubbles

[Reefie]

Anyone know a fix for microbubbles from the Tunze 9002 skimmer? It's 2 weeks old and was working great for the 1st few days. Then it started gurgling, that was when I started messing with the water level and the adjustment valve. Now either it over skims WET or I get mircobubbles. I even tried pretty much closing the valve, but I get massive microbubbles.

Does anyone have any experience or a fix?