Interesting Observation

[Myka]

So plug it back in and see what happens?

It's always been recommended to not use UV during any type of carbon dosing because the UV kills the bacteria which causes them to release the N and P in their cells back into the water rather than the bacteria being skimmed out alive by your skimmer.

You have the biopellet effluent going into the Intake of your skimmer, right?