I bought a small zoa frag about a week ago that had some “string” coming off of both the stalk and the plug. I pulled off what I could, but, after returning from a week long vacation, they’re all back and there’s more than before! I’ve tried looking this up but can’t seem to find an answer. The other zoas I bought at the same time haven’t had this problem and they came from the same tank so I’m a bit stumped