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They're Sally Lightfoot crabs, Percnon sp. You see them all over the Caribbean, in varying colors, on the rocks along the shore, and on dock pilings. There are other similar Sally Lightfoot species in other oceans. Cardisoma guanhumi is a much larger land crab that's pretty drab.

It looks like a sabellariid worm - they can build little reef structures. Were there a bunch of them?

I agree with cgills - it's a tiger grouper. It definitely has the protruding canines, and the bands can fade on older fish.

I'd say it's a rock flower anemone - Epicystis crucifer. They come in a variety of colors, and that one is beautiful!

It's a sculpin. From the photo, it looks to be about 6 inches long (based on the hydroids behind it - Tubularia crocea). It looks like a grubby, Myoxocephalus aeneus. But it could be a young shorthorn sculpin, Myoxocephalus scorpius. The web page for the Fishes of the Gulf of Maine is a great...

Yes - #3 is a maze coral with polyps out. Try googling "meandrina meandrites, night" - that will turn up a few pictures. As far as the edges, the colony will take on the shape of the substrate on which it's growing. #5 is Lobophora #6 also looks like Condylactis - these anemones can be a...

I'll agree with Kukuisa on #1 (pen shell) and #4 (boga). #2 looks like a giant anemone - Condylactis gigantea #3 is a maze coral (Meandrina meandrites) with its polyps out #5 I'm guessing you're asking about the green semi-circles? They look like the macroalga, Lobophora variegata, but the...

They look like the commensal zoanthid Parazoanthus sp., possibly parasiticus.

I would guess it's a Lymphocystis virus. FA181/FA181: Lymphocystis Disease in Fish

I'd go with the tomtate.

If the sponge has a rough surface (can't really tell from the photo), it might be Ptilocaulis walpersi, which is red to orange, irregularly shaped, and is commonly encrusting (the photo looks like the sponge grew over something, perhaps a portion of that sea fan that's poking out from behind it).

I don't know where BHB is, but the urchin looks like the burrowing heart urchin, echinocardium cordatum.

It's a sea hare, Aplysia, but I don't know the species.

Based on the size and the general shape, I'd say it's an amberjack, Seriola dumerili. I think the tail having one lobe larger than the other is just from the angle of the photo.

I agree that the first one is a helmet conch. I believe the second one is a mustard hill coral (Porites astreoides) with an encrusting sponge underneath (possibly Mycale laevis). I can't help with the shrimp or the lacey pink thing.

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...

It looks like a gag - Mycteroperca microlepis. You'll get a lot more responses to ID questions in the "Name that Critter" section. Not much gets past those guys.

A good site with lots of stomatopod pics is "Roy's List of Stomatopods for the Aquarium" w.ucmp.berkeley.edu/arthropoda/crustacea/malacostraca/eumalacostraca/royslist

It looks like a type of turban snail, possibly the longspine starsnail (Astralium phoebium).

The bristle worm looks like a red-tipped fireworm - Chloeia viridis.