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View Full Version : What is this stuff growing in tank?


jonnybravo22
04/22/2012, 02:23 PM
http://i559.photobucket.com/albums/ss35/jonny_bravo22/IMG_1424.jpg


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.

blueavatar
04/23/2012, 06:04 PM
i would like to know what is this stuff and how to remove it , anyone help ?

Asureef
04/23/2012, 06:28 PM
Looks like cyanobacteria.