They don't work that way, the airline for your is supposed to be unresticted. The flow valve controls the level in the neck. It will not create skimmate all the time. None do.
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Its a HOB SkimmerRaise the body of the skimmer, adjust amount of water flow in, and adjust air. Thats how you find the sweet spot, at least on my skimmer. I had the same issue, bubbles and water shot out of the top until I raised the skimmer body out of the water a little and then fine tuned my water flow in and air.

