I have a 180 gallon reef tank with 2 x 1" drains that are routed separately to my sump and 1 x 1" return that is split into two at the tank. I just recently added a 1" flow sensor to the second return so now I have flow sensors on each drain and on the return. I had only been monitoring one drain prior.
I'm seeing some odd results and wanted to see if they were normal. The return sensor is saying I'm returning 771 GPH to the tank but one drain is measuring 531 GPH and the other 892 GPH for a combined 1423 GPH. I would have thought that the amount of water I return to the aquarium would be around if not equal to the amount I'm draining? Am I correct in assuming this? Do I have a problem a with my return sensor or do these results seem normal?
Thanks,
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