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Your salinity is a bit low, but I don't think that would cause polyp recession like that. That head may recover, but it may not. If it does not, I'd remove that head.
if it were me, I wouldn't touch it unless it fully dies and bails out. Nothing bad can really happen from giving it more time, it doesn't look like a malady that would spread to the other head.When is it a good time to call it quits on the head?