Help identify please...

[ndorfn]

I would like to know what this growth on my rocks is and if i should be concerned with it?

Thanks in advance.

I will try to get a better picture later.

 

[ndorfn]

Bump... anyone want to take a stab?

 

[theJ]

looks like a little sponge to me. Got any clearer pics?

 

[dpaynter]

It might be a formaniferan, if it is very small. Hard to tell from the picture.