Zoanthid not opening for about two weeks

[SOGavity]

The 3 zoanthids i have are my very first corals. I got them back in June. In zoas (all three) had hair algea growing on them, but didn't seem to bother them too much. (The hair algea seemed to grow only on the zoas and a candy cane coral, but no others or rocks and sand). The hair algea just disappeared one day and ever since then one of my zoas haven't opened. I don't know the exact names of the zoas. One is green, one is red, and the other one is purple--the one that isn't opening. I left it alone for about a week, then decided to give it a Revive bath. A week after that, I moved it put of the light hoping that would help. When it didn't, about two weeks later I moved it closer to the lights. It still hasn't opened and am wondering if it ever will.

Salinity 1.026
Temp. 75F
Ammonia 0
Nitrites 0
Nitrates 10 (I know it's high)
Phosphates 0.5
Calcium 410
Magnesium 1480

 

[GSPClown94]

Looks like there is still something growing on the zoas in the first pic, can you get a closer pic with more detail?