What kind of sponge is this?

[cait.evers]

So I thought this was hard but it turns out it’s not not hard so i’m guessing sponge? What kind is this??? It just started growing in my tank randomly and I have no idea what it is

 

[elysics]

Looks like a green algae with a (bacterial?) growth on it

 

[Justanano]

It looks like it's not an emergency.. and you start a second thread of the same thing in the emergency section