My apologies, with the large size of the image I was only seeing half the image until I scrolled to the side. As you have them set, in synchronous mode both pumps should pulse from 30-100% at the same time, if no photocell is connected, this should work always unless one controller or the cable has a defect or the cable is loose. In inverse mode one should be at 30% when the other is at 100% and then they switch. Something is wrong with the cable or one controller to get the result you have.
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Roger Vitko
Tunze USA
"He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!"
Current Tank Info: 210 gallon planted tank with Altum Angelfish
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