Help with my Favia?

[Mmcghee102485]

Can anyone point me in a direction of what might be making my favia start receding? I’m just getting over a fight with dinos in the tank, not sure if that might be a cause or not.

no3 15
Po4.09
ph 8.1-8.2
Alk 9
Ca 390
Mag 1400

I have red sea 90 leds for lights...

tank is about 9months old, the rock it’s currently attached to I added a couple months ago.

 

[vetteguy53081]

Mag should be around 1300
PO4 about < .05

salinity. 1,025
Ph. 8.1 - 8.3
Alk 8-9
Ca. 450
Nitrate. < .03

moderate light and water flow and I never place mine directly on sand as it can blow on them and irritate them