These cone shaped tube-dwelling worms (two here) live on coral and most of their bodies are in a hole bored into a live calcareous coral. The colourful spirals are their tentacles, which are used for feeding and respiration. The coloured part is only about 3-4 centimetres in size and they are retracted into the burrow at the slightest movement near them.
That is probably one of the most amazing little creatures you've shown up to date! It's like something out of an animated movie. Excellent catch!
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