Do you know what this is?

[Ken Cyrus]

It seems like a soft sack with something in it.

Ken

 

[tripdad]

Any chance of a clearer image, less blur?

 

[Ken Cyrus]

Two others

 

[Poseidon03]

That is definitely pineapple sponge

 

[Poseidon03]

They're harmless filter feeders

 

[DFR]

They look like sponge to me. Providing that they don’t move that would be my first guess.

 

[mta_morrow]

Sponge!

Good!

 

[Ken Cyrus]

Ok, Thanks
I keep an eye to see if they move.

Do they multiply or grow

 

[mta_morrow]

Ok, Thanks
I keep an eye to see if they move.

Do they multiply or grow

They typically grow a bit more, usually lower light or shaded areas. They come and go.

Sometimes they grow amongst my zoas. I will use tweezers to simply pull it off of them.

If they are just on the rock, I leave them. They are a good sign of good water quality

 

[Ken Cyrus]

Thanks, good information..
Like the good water quality part, I'll take it

 

[Ryan1783]

Sponge

 

[4n2xtacy]

That looks like a sponge. They are very great filter feeders.