Weird spongy stuff on rock

[EvanDeVita]

Hi all, I just saw this weird spongey stuff in my rock.. can anyone Id it and help me?

 

[Udest]

It's a sponge can tell by the holes it made you can leave it or scrape it off that spot it won't hurt anything.

 

[EvanDeVita]

It's a sponge can tell by the holes it made you can leave it or scrape it off that spot it won't hurt anything.

Is it beneficial?

 

[JGT]

You identified it in your description. sponge, filter feeder, good guy.

 

[EvanDeVita]

You identified it in your description. sponge, filter feeder, good guy.

I’ll leave him be then . Thanks all!