Mp40 feed mode triggering ATO

[DVal]

I've got 2 MP40's on a 6ftx25in tank. Whenever I go into feed mode, the ATO triggers on (osmolator). Is this a common thing? Nothing is connected to a controller at this time. Wonder if they are positioned too high in the tank? They are not suckling air or anything.

 

[KorlL]

Is your ato level in the display tank? If it’s in the sump, I can’t see a reason why the ato would turn on when they’re on feed mode.
Just make sure the ato sensor is in calm area in the sump is my only suggestion

 

[DVal]

Yup. In the sump. Its in the return section. It literally does it every time without fail. Really weird.

 

[ingchr1]

Are the powerheads in the vicinity of your overflows?

What could be happening is the powerheads are causing a water level rise at your overflows, causing more water to overflow. When they are off the level at the overflows is lower, causing less water to overflow and a drop of water level in your sump triggering the ATO.

I have an AIO but that is exactly what happens in my tank. When I shut off the powerheads level drops in the return chamber triggering the ATO.

When I shut off the powerheads I also shutoff the ATO.

 

[DVal]

I believe that is what is happening. They arent really close to the center overflows but the current word be meeting in that area.