Red Sea skimmer 300 noise

Weird. Do you think the buzzing noise is related to a vibration or to air?
 
I know my RS 900 makes a pretty good air sound from the so called silencer. I am going to try and vent this out to help with sound and also PH. Hopefully.
 
look like pump noise. I open all part and reassemble and still same noise.
 
What does the replacement do?
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

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  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%
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