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Originally Posted by Toothpaste11
I have a SeaClone Protein Skimmer. I only have about 1.5 inch of opening between my glass lid and the rim of the tank for the pipes to go into the tank. Kind of limits the options 
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Seaclones are on the low end of the skimmer hierarchy and are known to be very loud and inefficient. I used to sleep right beside my old 20 gallon tank which ran AquaC Remora and I could barely hear it. They are cheap and old but works great. You can also look into aquamaxx HOB-1. Not sure about reef octopus though.
Weird part is skimmer sound is so relative that one skimmer that appears silent to one may be like a vacuum cleaner to someone else.