First, very pretty zoas...those are nice.
It is kind of hard to tell from that picture, but it looks like some of the zoas are getting a little "fuzz" on them. This may be the start of some algae growth, which is quite probable given your phosphate levels.
I am not sure what kind of flow they are in, but zoas do not like algae on them, and it causes them to close up. So if they are in a low flow area, you may want to try blowing them with a turkey baster to remove some of the build-up, and repeat this on a fairly regular basis.
You could also try moving them to a higher flow area, or changing the directions of the power heads to get them some more flow.
If I am seeing things in the picture, and they do not have any fuzz on them, then please ignore this entire email except for the first sentence!
Stewart