The rot looks a little advanced to treat but try blowing the rot section away in a separate container as it should flake or rubble away from the colony.then give it an iodine dip, make sure you have adequate water flow in your tank and nothing near the toadstool to sting it.
change your carbon a little more often incase you have some chemical warefair.
If the rotting persists then cut the base off above the rot section and discard, dip the coral again and place back in the tank.
I dose iodine in my system and beleive helps my softies in there.
good luck
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