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Even at 350, your calcium should not affect polyp extension. Lighting does not matter with non-photosynthetic corals as far as being careful to not bleach or brown it out. Since they lack zooxanthellae they cannot do either of those. The only reason I said keep it in low lighting is so that if you do not get a response out of it and flesh starts dying it will not grow algae. If it does grow hair algae it will be really hard to remove all of it without damaging the coral.
Turning the lights off won't really help. You need to look at it at nighttime after your lights have been on for their regular cycle. You will probably want to wait at least an hour of the lights being off before you check it for polyp extension.
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