Zoas and Polyps

For the past month my zoas and daisy polyps haven’t been opening. At first I thought they were just spreading out but know I’m wondering what is wrong with them. I cleared all the algae from them and did the Lugol Iodine dip this past Sunday and still nothing. Could they be dead? Last time I tested my water it was good. Anyone have a suggestion of what my next step should be? Thanks