What is this on my Candy Cane Coral??

[TX Twin Mommy]

Can anyone tell me what this is? I think the one in the middle is a Feather duster, a very small one, but what is the clear thing next to it on the right? It almost looks like some sort of mussel or clam. Any ideas? Is it good :cheer2: or bad:Cry: for my tank?

 

[Reefing Madness]

First pic, yea I agree, looks like some sort of Filter Feeder.
Second pic, no clue, can hardly see it. You tap on it to see if its got a hard shell?