Skimmer bubbles constantly collapsing

[jordsyke]

Hey,
My Vertex Omega Skimmer is dialed in perfect and skims great, but as soon as I feed or put my hand in the water the bubbles collapse and won't come back for hours after. Should I introduce more air with the venturi? Or maybe it is skimmer location, I have the inlet of my tank return close to inlet of skimmer pump, should it be this close?