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To me, whenever a coral is not opening (in this case, not inflating fully, if at all) it is a sign of irritation or stress. This can be water parameters, flow, lighting, another coral bothering it, etc. If in a day or two the Sinularia still isn't inflating, I would try moving it to a different location to see if it does any better, and take it from there.
Only my.02
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-Ant
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