Nano Auto Top Off?

thanks all for the help... decided to go with the elos osmocontroller - in spite of it's high price, it seems to be the smallest probe, and will be the least obtrusive, not to mention the fact that I'll be able to reuse it if I ever get my larger tank going. thanks again for the advice.
 
I run an Elos Osmolater. Simple to set up and it is in my third chamber. Reservoir is a kleen kanteen stashed behind the tank. Water level is always perfect.
 
I've used ATOs very similar to the Avast brand. There were a few differences like the backer and blue hose weren't there, but the clear sensor tube and hose coming out of the top was the same, and an identical magnet was used. There was no logo on the plug in controller box... But I had to replace these units as they were often very inconsistent with the water level. Sometimes these kits would work fine, other times they would over/under fill the sump. They were also a huge pain to get functioning properly after a water change or any other time that they were exposed to air.. Sometimes tilting the unit to release any air trapped would fix it, other times it would not.

I am currently using in tank/in sump ATOs from Autotopoff.com
 
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