White fungi on rocks

[Tiberio]

hello, my rocks have some white stuff, it seems to be some kind of sponge, does anyone know what is it? Is it bad for corals?

 

[Y&Y Corals]

Thats sponge its good filters your water means you have a good husbandry its should not be an issue if its not touching corals

 

[Tiberio]

Thats sponge its good filters your water means you have a good husbandry its should not be an issue if its not touching corals

thanks, the sponge its growing really fast and now it's touching some corals :/