What is this????

[UkiahTheTurtle]

I have no idea what this is I have found it on a snail and on a rock and on a crab

I this by any chance harmful to my reef any help would be great thanks in advance

 

[JGT]

I have no idea what this is I have found it on a snail and on a rock and on a crab

I this by any chance harmful to my reef any help would be great thanks in advance

Need better pics, can’t tell . Could be a white sponge but pic is too blurry to know for sure.

 

[KJ]

Sponge.

 

[UkiahTheTurtle]

Thanks I read on it a little bit and i think it is a pineapple sponge are they harmless or harmful