
Bought for a 10 gallon AIO water box. Behind it hardly fits and not with suction cups. My tray is 3.5 inches wide and you need to allow about another half inch for the suction cup mounts. I had to remove the suction cups, push the device in, and rely on a tight fit to keep it at the correct water level. It's not exactly a loud engine noise, it just sounds like a gurgle of water, like a hot bath, not intrusive. I don't see any microbubbles, the package arrived completely torn and the box was smashed and opened which was also annoying and putting it in a box instead of an envelope would have helped against the damage but the device itself looked fine. during the phase.

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