i think my large cup coral is dying. i was having a lot of luck bringing part of it back that was dead when i got it, but now i think it was stung by the frogspawn that was in my sisters tank that she just gave me (it didnt make the transition). the tentacles when floating around and landed on the the cup coral. when i sucked them off with a baster, there was a dead spot. now it seems to be growing.

my question is this ... do you guys think it would be safe for me to cut the flesh of the coral off, just past the dying spot. Pic is below.

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