I used to think I had 0 phosphate or close to that with standard test kits (e.g. Salifert), then I got the Hana Checker. It showed that I had 0.1 ppm! I always had algae problems and coral RTN/browning. Then I got some GFO and biopellets. I managed to get a reading of 0.04 with the Hana Checker. I think 0.07 is a bit high and may cause you algae issues. I still have trouble eradicating all my red cyanobacteria and bryopsis.
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180 gal tank, 50 gal sump, PM RFCa6 Ca Reactor, SWC Extreme 250 1A Cone Skimmer, Tunz Osmolator ATOF, Aquacontroller Apex, Aquaillumination Sol Super Blue 6 x 75w Units, Acros/Softies/LPS/Mushrooms/Zoos, Purple/Powder Blue/Yellow Tang/3xBlue Chromis/2xTomato Clown/Lawnmower Blenny
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