If it's brand new it will probably still have a covering of lubricants/etc (food/human/fish safe) that takes a while to break in.
I would take it out and give it a vinegar bath (large rubbermaid, RO water with say 2 cups of white vinegar - total liquid volumn to the recommended depth of the skimmer) and run it...
This also works after a deep clean... After I gave my skimmer a really good cleaning it didn't do anything bubble-wise - so I ran it in a bucket with just water, and as soon as I poured some vinegar in BAM it started working. I rant it like that for an hour, rinsed it quickly, and put it back to work.
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Single System Setup: 210G SPS reef, 225G FOWLR, 72G water change, 50G frag, 120G sump. I promise a journal at some point! (anyone need some coral frags? I likely always have stuff that is frag-ready)
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