Help with Zoa's

[Lisak]

I have a 29 g nano tank established for years and then had a power outage in July and had to restart, but my large rock of zoa's survived and all seemed to be going well until one morning it looked like a "sandy worm" had crawled over them and they will not open. I have tried to manually remove it with tweezers and a turkey baster but it just leaves a spiderweb like residue and the zoa's won't open . I have 2 maroon clowns and snails but no crabs. What is this and what can I do to get rid of it? Thanks for the help! Lisa

 

[cdemoss01]

Odd.. @vetteguy53081 can you help here?