erndog1001
Premium Member
I've been watching a piece of rock in my tank now for about a week. It has something black on it that seems to be growing quite fast.
It has no real shape. Just seems to be covering the rock fairly rapidly.
The only thing it really looks like is sponge. Except that it is staying flat on the rock.
Is it a sponge?
It has no real shape. Just seems to be covering the rock fairly rapidly.
The only thing it really looks like is sponge. Except that it is staying flat on the rock.
Is it a sponge?
