I lost my birdsnest last night to rtn/since. I noticed it yesterday before I went to bed and this morning it was 90% gone so I took it out and put it in my office tank. It's lost more tissue today. Not sure what happened. Tested ans po/ni are low .018 po and 2 no. Ph low 7.7. Dosed both no and po and house has been open and skimmer running without the collection cup. Not sure how they got this way as I have been feeding very heavy since the new fish came in 2 wks maybe. Prazi isn't supposed to affect levels as far as I know. None of the other corals have been affected. I thought birdsnest were an easy sps? I have had this one for a while now so i am really stumped. Did a small water change but I don't think it was enough to change anything. Will test again tomorrow am to see.