Some of you know I was in a big battle with cyano recently and did a 5 day blackout and peroxide. My nitrates and phosphate we're both low but detectable right where I wanted them. My hammer coral has been looking puny though and there is some brown stuff growing on its skeleton causing recession. Everything else seems happy enough. I tested this evening and had 0 nitrates, and 0 phosphate. I had backed down on the feeding to help deal with algae, but not that much. The diatoms are finally burning out. I dose approximately 3 ml of algae barn phyto in the evening and have been for a couple of months and this is the first time I've seen the nutrients bottom out and think that maybe one of the things aggravating the hammer coral.