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Sounds like zoa spider - a particularly nasty pest that burrows into the stalk of the zoa and eats it from the inside. Difficult to eradicate once you've got them. I'd suggest you get rid of the frag and check any other zoas you have. Do a search for more info as to how others have dealt with them. I found the only way was to inspect manually and it took several months, although I did have a lot of zoas.
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