jonnybravo22
New member
it's like a black tar. it's thick and only grows on the rocks. can remove like clay with tweezers. it was on one of the rocks when i firrst put in tank, took as much off as i could and it was not an issue for 4 months. last week had 'normal' brown hair algae growth with missed water change and now in addition this black stuff is all of a sudden spreading on several rocks. any help with ID would be great. Thanks.
