I'm not sure what's happening. I'm guessing bailing out. I've done absolutely nothing. Po4 did bottom out because I'm battling a hair algea bloom. I did raise po4 to .04.
Alk- 8.7
Cal- 479
Mag-1424
Salt- 35
Ph- 8.18-8.32
No3- 10-15
Po4- was .00 now .04
My guess is most likely bacteria infection, which is more than common for euphyllia. This one might be beyond saving imo. Hopefully the diseas hasnt spread to others. I would recommend removing it from this system if you can to prevent further contamination.
My torch had half it's polyps bail over a few days because of a change in flow I believe. My return nozzle usually rotates in a circle but got stuck and was sending a stream of water right at it it was a day or two before I noticed. Now he's doing better. I didn't move it or dip it and it's going great again now for it to grow over the dead polyps.