I believe this algae is called "Y" branching algae. It is taking over my overflow. I have to clean the grates every couple days. Right now, it is only on the overflow box but I am afraid of it spreading onto my rocks, taking over my SPS tank. I have fairly pristine water and this is the only algae that is present. \r\n\r\nDoes anyone have any ideas on getting rid of this crap?\r\n\r\n[IMG]http://i7.photobucket.com/albums/y286/SSS555/P1010329.jpg[/IMG]\r\n[IMG]http://i7.photobucket.com/albums/y286/SSS555/P1010330.jpg[/IMG]\r\n[IMG]http://i7.photobucket.com/albums/y286/SSS555/P1010328.jpg[/IMG]\r\n\r\nThanks!!!