favia corals

[guri]

Hello
I have a several favia corals one of them has a problem edges are fading they became lighter in color and thinner rest of the corals are ok
Anybody knows what’s happening with my coral
Thanks

[vikrant432]

first check the salinity then see any borrowing clamp or snail is disturbing it from the bottom of the specimen nitrates and phospates levels in your aquarium should be maintined below zero
then reply to me
thankyou