I too had the same problem with the Jebo skimmer.
I own one, and it works well for me.. It just takes 2-4 weeks to 'break-in' and develop a slime coating so that the micro-bubbles don't enter the tank. If you read the instructions properly, it said to rinse very well under water first, which I didn't do and it took even longer to 'break-in'..
Microbubbles will harm your live rock, and your fish, so be careful.. I just put mine in a 10g tank with some decaying food, lighting and a small chunk of liverock to get things going..