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My guess would be red gracilaria spp. It's a fine food for grazing fishes like tangs. It also is the key ingredient from which agar is derived, which has many practical uses from vegetarian gelatin to a medium in which to culture bacteria and other similar organisms.

I agree with what Cranberry said, Bursatella leachii "Blue Dot Sea Hare" Definitely.

I second that definitely a tunicate, I've never seen one that color before though.

Clibanarius vittatus, "Thin Stripe Hermit" Eventually grows large (fist sized), so shouldn't be considered reef safe. Doesn't seem to bother corals but has been reported to eat feather dusters and snails. Make sure you have LARGE shells on hand. May do best in aggressive fish-only type tanks...

That's a Red Rock Crab and while being rather benign as juveniles they are extremely predatory as adults with large claws capable of crushing other crabs and snails, also can move very large pieces of rock. Very enjoyable in a species tank though since they eat with such gusto. Definatley Not...

I think it could have been a moon snail because when they are out and about their body contracts over the the top of their shell making it appear as though they don't have one. If so he may have starved because this species lives on a diet primarily composed of clams. Here's a pic

Caribbean Worm Snail of the Petaloconchus species. This is a rather uncommon reef inhabitant that feeds by secreting a long line of mucus that it uses to catch suspended particulate matter, which is then reeled in and eaten. Nice Snag I'm Jealouse

As far as I can tell there are two different varieties of ghost shrimp for both salt and freshwater mainly because I have caught the saltwater type myself. That being said I've also been able to get freshwater ghost shrimp to acclimate to a saltwater enviromnent for a extended period of time...

Do you mean like the ones you see on the beach at night? and if so I would say yes since they are mainly scavangers, however I don't know wether or not they need acess to dry land to survive since thats were they make their burrows during the day. Adult's also get very large about 4-5 inches.

Yes I have one of these little guys aptly named Pom-Pom, on a rather interesting side note when I bought him he only had one anemone but recently the one has split and become two now he has a complete set of "Gloves"

Get yourself a nice thorny oyster, I got one a few months back and it's doing really well.

I can't be 100% sure but due do the difference in the size of its front claws I would hazard a guess that it's a Fiddler Crab, most fiddler crab's are beneficial scavangers but can occasionaly attack sleeping fishes. As long as you keep him well fed he should be a great addition to your tank.

That's a Sally Lightfoot Crab, adult males of this species are extremely predatory and will kill with reckless abandon.They are also exceptionally fast so if you want to remove it you will have to use a trap.