Newbie Identification help needed.

[Reggae Fish]

I just got a new piece of rock today it I think it has some extra stuff with it. In my gallery are the photos

#1
It looks to me like a few mushrooms which I've labeled "mushrooms" in my gallery. Will you please confirm if these are mushroom.

#2
I have no clue what this is so I labeled it "I have no clue"

#3
This is not from the rock I got today...This was a hawaiian featherduster but I don't know if it's still in there. Is there any way to tell if it left it's tube. I labeled this one "featherduster"

I appreciate your help!

Thanks,
Justin

 

[Sk8r]

They're mushrooms. Look up "discosoma." That's a broad category, but as these open out they'll look more identifiable.

Your featherduster is probably still in there. It will await good water.
"Ihavenoclue" looks like a green stripe mushroom. They're nice, if that's what it is. They're another discosoma, but different than your first batch.

 

[Reggae Fish]

Ok, by recommendation, I tried moving the Plate Coral (pretty sure) to the bottom and off the rock. However, it is on there pretty good an this is a first for me. It just showed up on the LR I got. For the bottom I use CaribSea Tahitian Moon Sand. Is it ok to move the plate to that? If so, how should I do it?

Also, it looks like the plate has lost it's green colors etc... and it just very pale and hard. Is it dead? If not, should I just leave it alone?

Also, what should I be doing to feed or take care of it. Before I got corals, etc... I was going to do months or researching but I just found it on the rock so I want to take care of it and hope it works out.