Nov 5, 2013 #1 Bendyboyben Aquarium Advice Apprentice Joined Oct 20, 2013 Messages 37 just wondered if this was coraline algae if not what is it please
Nov 5, 2013 #2 Sniperhank Giant Clam Addict Joined Nov 18, 2011 Messages 20,651 Location Summerville, Pennsylvania That looks like cyanobacteria.