ATO and tank water level

[nvanells]

Good morning everyone. I have a 93 cube with a durso overflow. I am having a hard time getting the water level to stabilize when the ATO kicks on. I have the hydor ATO. My reservoir is in my basement using another return pump to pump the water upstairs. The tubing you see in the picture coiled up is the output. This is a picture before the tank was filed with water. Originally I had the sensor and the output tube in the return chamber of the sump. This lead to the tank overflowing multiple times. It doesn't happen all of the time, most of the time is fine. I moved the output to the overflow of the tank. I turned down the flow and it is still overflowing. Not as often though. Now it will trip the alarm for taking too long (10 minutes). What should I do? Purchasing a different ATO isn't an option ATM. The hydor seems to be working as intended.

 

[Benny Morosco]

The censor needs to be near the overflow output or skimmer so it shuts off your pump

 

[Flippers4pups]

ATO sensor needs to be in return section of the sump.