Protein Skimmer

well depends on the skimmer you have , but for the most part they should have an air line that has a valve that you can adjust for the airbubbles, and the collection cup should have a height adjustment , well be able to help more once we know the skimmer your using
 
+1 JC, Tell us what skimmer and we can look it up, but what has been said is correct, should be a dial somewhere to change it
 
I had the model up from this! The hose that is drawing water from the tank, follow it along, I believe there will be a small black circular dial which will allow you to change the air flow. It should be close to the skimmer on the top of that pipe.
 
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