Any Idea What It Is

[begginer10]

This Yellow Thing Just Popped Up On My Live Rock Any Ideas????

 

[theappe]

sponge. dont think its bad. I've had some of those for a while now, still hasnt done anything

 

[begginer10]

Thanks

 

[reefkprz]

it is a sponge and its awesome filtration, they filter about 10x their mass in an hour.

 

[begginer10]

Thanks For The Info, I Appreciate All The Help On This Board