Inconsistent Phosphates

[straightrazorguy]

I forgot to mention I've had a refugium full of macroalgae and a turf algae scrubber for months. I also started running biopellets on April 1 and have been dosing kalk automatically since January. I don't have a high bioload (6 2-3 inch fish in a 55 gal with a 33 in-line refugium).