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Looking at this video review it seems to be normal for this type of skimmer. Notice micro bubbles by blue tube.
https://www.scaquariums.com/product-p/sca-301.htm
Which one?
Bottom two are old school koriala.
Then the Jeabo in right but she about top but seem piece over impeller is missing. It works and impeller doesn't fall out. There is piece to stop it.
I can hold items for a short period. See pics.
Hose, power heads, venture adapter, I
30 inch power compact lights, only one side of blue works.
Two little fish reactor holders, two T5 tank light brackets.
Large Jeabo pump works, just have to manually kick start after feed mode ends.
I believe he is talking about the air unattached to the pump.
I would check the airline is not cracked and no holes as that will release air.
The hose must fit snug in the pump, cannot be loose or stretched out.