BTA not opening?!

[Floyd-]

Parameters are:
Temp: 76f
Salinity: 1.024
Nitrate: 2.2ppm
Phosphate: .04ppm
PH:8.1
Alk:8.3
Cal:460
Mag:1440

I have 3 BTAs and they are not opening. They wander around a bit but other than a peek to open a tiny bit they dont extend their arms.
I think PAR was about 250-300 where they are.

 

[KrisReef]

Something isn't right. How long have you had them? Have you looked at them when the lights are off?

 

[Floyd-]

Ive had them for about 6-7 months and they used to puff up real big and have beautiful arms. With the lights off they look the same. I have soft and hard corals that are looking great but these guys don't like something and I cannot figure it out.