most likely you have a leak in the line...either at the connection, or in the line its self...just a pin hole or smaller will allow air to be suck in to the pump, which will then create the small fine bubbles....if you are using hose clamps, tighten them.
Or your skimmer is to close to the intake, and the oveflow from the skimmer, or the return line from the tank is allowing bubbles to be sucked in...if this is the case, place filer media like boi balls or felt in front of the pump to intercept the bubbles...



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