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Scotttyd

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Location
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What is this? There were five of them on one coral head.

nudibranch.jpg
 
Bristle worm... DON'T TOUCH!!!

I didn't see it in the first pic.
 
The first critter is a lettuce sea slug - Elysia crispata - actually an opisthobranch, not a nudibranch. When I was last in Bonaire, they were all over the shallows, especially at night.

The second one is a bristleworm, or fireworm (having accidentally touched one many years ago, I prefer to call them fireworms) - Hermodice carunculata.

Try posting ID questions in the "Name That Critter" section - you'll get your questions answered pretty quickly.
 
https://www.shearwater.com/products/peregrine/

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