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Old 09/16/2018, 09:21 AM   #2
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Join Date: Apr 2002
Location: Olympia. WA.
Posts: 8,567
I have had 4 of the gen 4's for about a year and yes the fans do stay on 24/7, but I can't hear them until I get my ear within a foot of them.
Standing in front of the tank, normal viewing distance ( 2-3 feet away) I do not hear them.

240 gallon soft coral tank
50 gallon lps tank
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