I don't see anything wrong with .08 - .10 po4 and 2-4ppm No3 I have seen very nice full sps tanks running higher end with beautiful colors. I run full Zeovit so I'm on the near zero spectrum but I have to dose to keep colors nice. If I don't my sps pale out. I have switched to Phols concentrate and that has darkened and helped color up. But my sps grow well and have nice colors. If I could get .08 and 2ppm I'd be a happy camper.