Yep it does look like it but it's actually soft layers on top of the rock and easy to get off. My buddy (who had his cyano problem a few months ago) was over Saturday night and agreed it was too.
Thanks for the Maracyn idea. Tomorrow I'm going to extensively clean my tank, including that rock, and see what happens.
Exactly...but still makes me wonder why it's on just the one rock.
Thanks for the Maracyn idea. Tomorrow I'm going to extensively clean my tank, including that rock, and see what happens.
but if you don’t eliminate the source or cause of the cyno it will eventually return.
Exactly...but still makes me wonder why it's on just the one rock.