Id required on two items

[bigmac]

First item is some growth on my live rock (Fiji if it helps anyone). For the life of me I can't find anything similar to compare it to. I've got 4 of these green growths altogether.

The second item (hard to see and don't mind the broken piece of eggcrate at the base of it) is some type of critter living underneath the rock. It "creates" a column of sand around it, extending out by an inch or so. You might not be able to make it out, but there are two antenae or "feelers" poking out from the top of the column of sand.

Any suggestions or comments are welcome.