Good idea Maggie. I was able to pluck this off by hand. I really scraped at it with my nail to try to make sure it doesn't come back because there seemed to be a black base that the branch was attached to.
I wonder if this is something I will have to look out for now or if it was an isolated incident. Did you notice any more after trapping it in glue?
I only noticed 2 originally. One on a piece of live rock I got from LFS and I just crushed it. And the other on the snail. It's too soon to tell if there will be more