PSK-100 Skimmer Bubbles from output

Hello, I have a PSK-100 insump skimmer and I have been using it for about 6 weeks and it produces millions of microbubbles that are being expeled via the output. I was wondering if this is normal or what is causing this; my concern is some of bubbles are making their way to the display tank even through the bubble trap. I turned my return pump down to slow the flow through the sump and this helped alot but I am curious if there is a way to elimate these bubbles from the skimmer output. I have the skimmer in 9 inches of water. Any suggestion?
Thanks

 

maybe you can try it at 7-8 inches. i would say give it more time it that's possible. how's your bubble trap set up, can you describe.