I've been running the Tunze Nano ATO for 2 months with no problem. For a resovoir, I'm using one of the 5g water totes from the LFS; the wide mouth pouring lid is big enough to fit the pump in, and I rest the lid on top to limit evaporation.
I have the float sensor in chamber 3 of my BC32, and am keeping the water level in line with the top shelf in the media tray, which keeps the water line even for the Tunze nano skimmer in chamber 2.
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