Help! My zoas are not opening

[conflictrealms]

So i've had a colony of zoas on an oyster that have been in my tank around just over a month. For the first 3 weeks everything was great but the last week or so only a few are partly opening up with the rest remaining closed.

Water parameters have remained constant since when they were first in. Ive trued moving locations of them over the past few days but it doesnt seem to do anything.

Infact, i put them at high level for a day but some zoas turned brown???? So i feared i was scorching them or something.

I have 2 t5 tubes, 1 marine blue and 1 white.

 

[deeznutz1]

Fish list?

 

[conflictrealms]

Fish list?

2 clown fish
2 domino damsel
1 fire dartfish
1 cleaner shrimp
2 peppermint shrimp
4 hermit crabs

 

[conflictrealms]

Anybody able to shed any light on this?

 

[650-IS350]

Whats your pH, Mag and Salinity? actual numbers.

and did you properly acclimate them to your tank lighting parameters?

 

[organism]

Make sure they're getting moderate water movement, check for nudis, parameters, etc