ID Please

[jsteiert]

I took 3 pictures of some things in my tank I dont recognize. The first one is of some leafy dark green stuff growing around one of my corals. I dont know the type of coral either, any ideas?
the second and third ones are of these little things that kind of look like slugs, they are attached to my live rock and are all over the place. they never move or if they do I never see them moving. I would love to know if they are friend or foe...
Any ideas guys and gals?

 

[darknes]

The "green leafy stuff" is some type of macroalgae, and I'm not sure about the coral.
In the 2nd and 3rd pics, the things are harmless sponges. They're filter feeders.

 

[royal gang]

is it a yellow gonipora?

 

[jsteiert]

I'm not thinking it is yellow gonipora, when i purchased it the lfs guy said what it was but i cant remember. it started with a "f" but for the life of me I cant remember the name.