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Susan9583
Luis3725
Off-topic. To say for sure?... Who knows.... It looks like a mollusk...
William1830
This is a common vermetid worm. People have already asked. Here are better photos. Does it look like your creature?
Gregory9432
Yes, thank you, it looks similar, I think this is the vermetid worm.
Rodney7316
I had one living on euphyllia, if it gets in the way, you take calcium in a syringe and spray it into its hole, you get an Egyptian mummy - tested!