Lobophyllia having issues.. HELP

[jcro]

I have had this lobo for about a month now. It was nice and puffy a couple days after i brought it home. But this last week it is receeding and punctuuring itself.. any idea what might be causing this?

 

[cdemoss01]

Parameters are gonna be needed for a better diagnosis.

 

[jcro]

Parameters are gonna be needed for a better diagnosis.

Salt 35 1.026
Ph 8.1
Alk 9.4
Calcium 420
Mag 1440
Nitrate 11
Phos .06

I have 2 lobos in the tank.. the other one is doing fine

 

[thamnasteroid]

Magnesium's a little high, though I'm not sure it's high enough that it would be the issue. What is your lighting and flow situation like?