HELP! Yellow Toadstool in Trouble

[Beverly]

Over the weekend, I did an emergency rearrangement of the rock in my 42 gal hex reef and had my corals in buckets of tankwater while doing so. All the corals suffered a little from bucket treatment, but have all recovered except the toadstool. And it was one of my most beautiful animals

Since being back in the tank, the toadstool has begun to droop more and more each day instead of standing tall and opening. I noticed today at the edges that there was some either dead stuff, or something growing on it. I gently turkey basted off the stuff, but there is no improvement.

It also seems to be losing its footing on the rock it's attached to and I think that's why it's drooping so much.

What can I do to save this coral? Can I cut it near the base and reattach it, or will that damage it even more?

I give this coral another 2-3 days at the most before it's completely gone. Any and all suggestions are welcome.

TIA.