New live rock critters

[reef bound]

I would banish the crab to the sump if you have one......We missed a box crab when we went through our rock when we set up our tank and I'm pretty sure he ate a good bunch of my zoas, he definitely ate alot of snails as we found the shells in his house.
The feathery things are feather dusters and should be ok. If not, more will show up in time. The almond shaped thing looks like a little clam or mussel of some sort to me. We've got a couple of those as well, and they made it through our cycling.