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its been running for a couple of weeks
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Hmm, ok then. Like bizzybeas saud, it may be the additive you added to the tank that is making it produce the bubbles I guess you may have to wait it out and see what happens.
I know you said you have adjusted it, but go back and make sure it is correct. Setting the air valve so that the venturi device receives too much air will cause bubbles to pour out of my skimmer overflow so I would assume it would do the same to others.