Bubbles in mine at the bottom of the chamber more just white, (can't really made out bubble size because so small and moving around). Midway up the collector cup ~millimeter to a couple at the top of the cup.
Found my current skimmer is quiet but on my first one there was quite the sucking noise. Found one of those little mufflers off a Maxijet quieted it a lot. Eventually added a piece of either 1/4" or 3/8" vinyl tubing X 4 feet to the venturi tube which made it near silent.
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