I've this asked on other forums, but I can't seem to get a clear answer. This is kind of a general algae question, not algae scrubber specific. Basically I can't seem to have any detectable nutrients in my tank. It's either zero or algae outbreak. I have a softy/lps tank and would like to keep some n03 and p04 in low levels. In this tank I'm actually carbon dosing, and whenever I cut back the dose, I just get algae in the display, no nutrients. It seems like whenever I start to raise the levels, algae in the display just sucks them up, no matter how low. Does anyone have any ideas on what to do?