I've been having an issue for the past month or so with cyanobacteria in one of my tanks, and I don't know how to get rid of it. I've looked up treatments for it, and all of them involved either changing lighting, avoiding overfeeding, and not using fertilizers. Well, I already don't use fertilizers in this tank, my lighting is already in the range of what I've read it should be (6500k) and overfeeding is definitely not an issue; I only have ember tetras and kibensis fry in this tank, so I don't put much food in to begin with. I'm considering trying a blackout, but it sounds like the results from blackouts are pretty mixed, and only create a temporary solution. I don't want to have to keep cleaning the stuff out every few days, so if anyone has had success getting rid of it, I'd love to hear how.