Hey jostafew! Rowaphos is powerful stuff and a test kit reading of 0ppm is a good start to eliminating an algae issue! But P04 is not the only thing that will cause or prevent algae growth (light, flow, nutrients etc). Some P04 can be a good thing, my tank sits at 0.04-0.08ppm on the high end but very little algae grows. I believe good flow and balanced nutrient levels keep it in check, if algae starts to grow more than usual, it's a good indicator my nutrient levels are higher than they should be. I'll dial back the amino's and coral feeding for a bit, and with some good wet skimming, that usually takes care of it.
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