That is a Condylactis gigantea. It will stay as it is white with purple tip

Yeah, the tents were looking pointy and weird before so I was not sure but sometimes when bothered they get like that.
The stridations on disc and red foot are what made me think LTA, does it have spotted veracue?
This is mine from way back during a swap, also bothered looking but a bit bigger than yours, but just for reference.
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So if it regains health it could end up being purple, feed mysis 2-3x a week to help regain health and dont blaze it w/ light right away, maybe place by a ledge area where it can pull in or out of light as needed.
Post pics later