What's hapening

[hkgar]

to this coral? any ideas?

PO4 .03
NO3 >5<10 Salifert
Mag 1365
Ca 445
dKH 8.0

https://photos.app.goo.gl/AgrWla2uhlT3YXAn2

 

[jda]

Do you have pests? I know that everybody thinks and says "no," but have you really looked? Any chance that a fish is picking on it?