Pat. I have 3 on my 180 and want a 3rd. I have 2 on the bach wall and on on one side. I want another for the other side. I don't have a closed loop and use a Eheim 1260 for my return.
If you have them on "wave" mode they make the most noise. Only because they go from slowest to fastest setting and back. In reef crest and reef lagon modes they are almost silent. The niose in Jeff's videos is not the pump. If I go by Jeff's to flash the new code I could bring my pump by for you to see in action.
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