I am also frustrated with this skimmer, same issues as posters above. Microbubble in the display "leaching" from the bottom of the skimmer, I have tried everything (including the stuff mentioned in this thread), my system has been running for a while so nothing on there and my skimmer is performing as expected no complaints there but I will have to remove this POS if i cant sort out the micro bubble issue.
I have taken a video of the bubbles being released and really hope someone can help me with a solution
http://www.youtube.com/watch?v=UghET5Pk2e0 (please switch quality to hd to see the micro bubbles)