GSP of All Corals to Have Problems With

[Glott3133]

I have a green star polyp coral frag that hasn't opened in almost a week. A few polyps have opened, but mostly has been completely closed. I have a whole host of corals that are all doing very well. My corals are all at least 2 months old:

Hydnophora
Digitata Monti
Torch
Hammer
Birdsnest
Mushrooms
Rock Anemone
Clove Polyp
Candycane
Zoa colony

What could be wrong with the GSP? My levels, lighting, and flow have all been good. Only thing I can say is that there was a snail on top of the GSP about a week ago that caused it to close that day, but it opened the next day. Any thoughts?

 

[ndrwater]

Give it time. GSP is almost impossible to kill

 

[Cory]

What are all your water parameters?

 

[Glott3133]

Ammonia - 0
Nitrites - 0
Nitrates -0 , not showing with current tests
Ca - 450
Alk - 7.7
Mag - 1460
Sal - 1.025

 

[S2G]

Gsp needs dirtier water. Whats your po4?

Alk is a little low as well.

 

[Glott3133]

Haven't tested PO4, and I just dosed Alk yesterday after the test.