Plant/Coral identification

[Shawn]

I have four pics in my album. Can you please help me identify them and tell me something about them?

Thanks.

http://maast.org/forums/album.php?albumid=125

[firecoral3msd]

I know that the third picture is green bubble algae. That stuff can some times get out of hand and take over. Luckily the green emerald crab loves that algae. I am not sure about the rest. Is this new live rock?

[Aqua-Dome]

1.elongate valonia "bubble algae"
2.unknown cool macroalgae
3. regular spherical valonia bubble algae
these algaes are interesting looking, but can possibly get out of hand. tangs and emerald crabs willl eat them.
4. looks like a sponge (harmless)

[tzhanks]

If you dont want an emerald crab in your tank you can use a turkey baster to suck the green bubble algae off of your rock.