Back Pack, lots of air bubbles

[Trevor Robertson]

Quick question for you all, I purchased a skimmer I was way over due and was having some issues so I thought it was time. I got a back pack unit as I knew it would fit behind my tank and the guy at the LFS said it was a good unit that he has had success with.

I have set it up and installed it and it is working okay but I am getting LOTS of tiny air bubbles back in to my tank and they are all over everything from my coral, my rock glass everything. I have since turned it off and added a Aqua Clear mini foam to the over flow to stop some of the bubbles that has helped but only by about 10%-15% so still unaceptable any tips here or should I try to return it and spend some more?

Thanks for the help