After returning from a weeks vacation, I noticed this weird growth around a new Zoanthid frag I picked up about 3 weeks ago from the LFS. I have never seen anything like this and the weird thing is that it moved before I even touched it with my glass scraper. If you look at the right corner near the sand, you can see a hole that reminds me of a jet-propulsion seen on some marine organisms. Does anybody have any idea what this is?? Thanks!
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