Help! Corals are struggling and dont know why!

[Dre619]

Hi guys. I need help. So my toadstool, mushroom and some of my zoas polyps are not opening up! My parameters are all good except Alk and pH are low. Any ideas for best way to raoise and stabilize these??? All of my other coral are doing just fine! Any help would be great thank you.
SG- 1.025
Temp 79
Alk reading at 7dKH
Amonia 0
Nitrite 0
Nitrate 5-10
Calc 360
Mag 1300
pH 8.2
Running Nicrew 100w light
Using cured wet live rock
Flow is good with 2 power heads
Plenty of surface agitation
Aquamaxx 1.5 protein skimmer

 

[Sharkbait19]

How long have they been in the tank? How old is the tank?
Many soft corals will periodically close only to open a few days later like nothing happened.

 

[Dre619]

Toadstool has been in for a few weeks now. The zoas and mushroom are just over a week in the tank. Tank is still young only 3 months old or so. Should i not be worried then? Just let them be and run their course? GSP and Anthelia are doing great! Some of the zoas polyps are closed and turning white. Could it be too much light for them?