May 1, 2012 #1 Amanda722 Aquarium Advice Apprentice Joined Apr 22, 2012 Messages 12 I have a rock that has this on it. That's what I think it is. What can I do? up on the Rick on the right. What causes it? Attachments image-101774535.jpg 185.4 KB · Views: 71 Last edited by a moderator: May 1, 2012
I have a rock that has this on it. That's what I think it is. What can I do? up on the Rick on the right. What causes it?
May 1, 2012 #2 ccCapt SW 20 & Over Club Joined Mar 15, 2004 Messages 5,365 Location Northeast PA Looks like cyanobacteria. It's caused by excessive nutrients in the water.