Good advice here so far. I had the same thing happen to my zoas. Great for a day or two then closed up. Mine were closed for a few months until i moved them to a high flow area. That area happened to be high light too. Anyway, they finally started to open up. Once I saw they were all open i put them back to a low flow area and lower light (on my sandbed) and they are still open and doing well. I have 2 zoa frags however that remain in high flow. They have yet to open fully but i see them peeking out every now and again to tease me.
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