Is there a link between using activated carbon and cyanobacteria ? This could be complete nonsense but over the past few years I've noticed that when I get cyano it's usually when I'm running carbon in my reactor and it usually goes away within a few weeks of me taking the carbon out of my tank. Obviously when I have cyano I'm doing other things to lower nutrients so it may not be related but I haven't had a cyano outbreak when I'm not running Carbon on my tank ? I've also thought that maybe my water isn't as clear when I'm not running carbon therefore the bottom of my tank is not getting as much light causing less of a chance of cyano ?