Zoo's Looking Bad

[Mikey B]

Hi everyone.
Just as I was thinking Zoo's were indestructible, every polyp on a little frag have shriveled up into skinny little fingers with a blob coming out the top.
The polyps from this frag that have spread to the rock next to the frag are doing fine.

All the other zoos and corals in the tank are doing great.

Is it done for? Does it pose a risk to the tank?

Thanks.

Mike