NUKE THEM NOW - NUKE THEM FAST!
I just tore down my entire tank. I killed off the live rock - literally everything that was living in or on it is now dead. Didn't want to, but didn't have a choice. All my corals were snapped off and given away. Zoos went into the sump as they are contaminated. The rock has been dried out, soaked in fw, soaked in vinegar and fw, rinsed, dried out and is now soaking in fw.
Until I get all the tulips out of the tank (off the sand bed, pumps, returns), then nothing is going back in.
Oh, btw - you can't isolate them. They detach and retach as they see fit. They will attach anywhere and everywhere. Some are so small, you don't even see them.
Nuke them. End of story.