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IM 25G lagoon - Tunze 3155 sensor keeps triggering

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I need some help with a Tunze 3155 ATO. I'm using the stock mightyjet desktop pump and it's on the lowest setting but the return chamber is still rippling so it's causing the Tunze sensor to keep coming on every few minutes when it's not evaporating! Thankfully I'm still cycling my tank. I can get a better video if you need it, I just wanted to show the return water rippling. How is everyone using this ATO? There's not enough room to center the sensor magnet due to the dual returns and 90deg elbows so it has to be near one of the 2nd chambers.



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