Sounds like water parameters could be out of whack. Small but frequent water change is your best friend as always. My GSP don't like low calcium level and stay closed when its low (200 or so, get it up to 400).
You can manually clean what you don't like to have from the frag and then put it back in. If it shows growth and not dissolving its still ok. The other reason for it not opening is something is bothering it or feeding on it.
Keep in mind that it is very hard to get rid of GSP once its starts growing it will kill almost any coral on its way especially SPS.
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