Euphyllia dying

[Bouriftw]

Hello guys. I have 60g reef tank with some soft corals,anemone and one lps (Euphyllia). But last 3days Euphyllia looks really bad. I have this coral 7 months and no problem until now. Other corals looks happy. E. Quadricolor split into 2 20days ago. Evereything grow good. I run skimmer, refuigum with chaeto+light, ecophos Reef Ecophos Fe and I using Tropic Marin Pro Reef salt.

In tank: Ricordea florida, Capnella, Sarcophyton green fluo, Rhodactis, Euphyllia glabrescens
Acanthurus pyroferus, Paracanthurus hepatus, Valenciennea sexguttata, 2 Amphiprion ocellaris, Chrysiptera parasema, 2 E. Quadricolor, Calcinus and Lysmata Amboinensis

9.25g water change every 2 weeks.
kH 8
temp 26°C
salanity 1,025
no2 0
no3 1
po4 0,10

It's too late for save this coral right?

 

[bam123]

Probably alkalinity swing or got stung or damaged by something else. Sometimes just happens. I have the same mix of corals. Lost a tiny yellow hammer in 1 day. Not near anything. The other hammers, frogspawn, cisterna are doing fine.

 

[bam123]

Did a rapid drop in phosphate can cause this extent of damage? Running GFR?

 

[Bouriftw]

Did a rapid drop in phosphate can cause this extent of damage? Running GFR?

I change gfo 2 week ago, but small amount

 

[AJQ69]

unfortunately, that torch is gone