Skimmers take time to break in. When they are new, they still have oils on them from being manufactured. You can run it in a vinegar solution to help break it in faster if you want. If not, open the valves as far as you can and give it time. It'll take a couple weeks sometimes.
Oh, you mean into the display tank. You can try to turn it down? I use cheap panty hose to avoid bubbles in my display on all returns, but there has to be some sort of adjusting in your case. Hard to tell with only blues on and not being familiar with the unit.