Tunze DOC Nano 9002 ....
No sound at all..only sound of bubbles.... skim half a cup out of my tank per week... minimal adjusting on the knob..and started to skim the very same night i put it into the tank.
I upgraded from a Aqua C Remora rated for 75 gallons... I must say this thing is so loud its not even funny... i can hear it from upstairs when the tank was in the living room... the skimming was so-so but for that price....i expected more....
So the Tunze for 200 buxs including tax.... was the best money i ever spent on my tank...
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