Curacao IDs please

[designbysue]

Can you help with common names for these please?

#1 (A cup coral of some kind?)

#2 (is the the same as #1 but with tenticles out)

#3

#4

#5 (is this a close up of the same as #4? I took it at a different location but they look similar)

#6 (beautiful piece of coral)

#7 (the hairy crab)

All assistance greatly appreciated - I do a slide show of my photos after a trip and like to add the names to the critters.

 

[Kukuisa]

Let's start with the easy one:
#3 is the shell of a (dead) West Indian Sea Egg.

#2 is a mat zoanthid.

#4 and #5 a knobby anemone.

K.

 

[Kukuisa]

#7 In the Giant Anemone: a Banded Clinging Crab.

K.

 

[designbysue]

Thanks -
I thought 7 was a banded clinging crab but he is so covered I wasn't sure, but didn't have a guess on the others.
Anyone have any thoughts on the rest?

 

[designbysue]

And one more question - What is the pink "thing" at the bottom of the Christmas Tree worm in this pic.

 

[Jim Greenfield]

Christmas Tree Worm
Is it the operculum with which it totally closes its tube when it snaps its tentacles inside?

 

[designbysue]

Thanks Jim - from a quick internet search that is what it looks like!

 

[TheDiveBus]

I would like to differ Kukuisa, #3 is the shell of a red heart urchin and #6 is the beginning of a Elk Horn coral.