Help id-ing mystery hitchhiker

[lumpy]

I've attached a picture of my mystery hitchhiker. I'm new to salt water aquariums and have no idea what this is. I'd appreciate any help you guys can give.

 

[Smitty]

I'm sorry, it's too blurry for me to tell.

 

[Bifferwine]

Maybe some sort of limpet. But the pic is kinda blurry. :(

 

[lumpy]

sorry I'll have to see if I can get a better image when I get home.

 

[FishyReef]

Is it moving or attached to the rock?

 

[lumpy]

It's attached to the rock. When I look this morning it looked like it had folded up on itself so that its a small rounded cylinder. This made me think it might be a zoanthid or a button polyp. But I havent seen any pictures of ones that are white.

 

[Bifferwine]

Now that you mention that, I think it may be a rock anemone.

 

[FishyReef]

If you're able to get a picture when its retracted that might help us too. My first thought was a paly or button polyp, or a tiny mushroom of some sort. How big is it when its fully open?

 

[lumpy]

It's smaller than a penny. Maybe 2/3rds the size of a penny. I just bought the live rock not quite a week ago and didn't see this little guy when I picked it up.

 

[lumpy]

I bought another peice of live rock out of the same tank from the same vendor and found what I think is another one of these mystery guys. Here is what I hope is a better picture. The darn things are so small and the live rock so craggy that it is difficult for me to get the camera to focus on it.

 

[AmberSunrise]

Looks like an anemone to me