ID on this?

[RWhitt907]

Moved a rock earlier today and found this slimy chunk of something stuck to the bottom. Not sure what it is.

 

[Troylee]

Sounds like a type of sponge. @ISpeakForTheSeas

 

[ISpeakForTheSeas]

Yeah, given the location and the handful of tiny holes in it that I can see, that's probably a sponge. The texture is pretty unique, and I only recall a few at the moment that have a similar texture, but I wouldn't feel confident enough to guess at a proper ID beyond that without clearer, closer pics.