Does high KH eliminate Cyanobacteria?

[banditpowdercoat]

How old of a tank? Alot of times, it's a phase the tank needs to go through. There is allways a ballancing act in the tank too. If you change one thing, ie new bulbs. That is often enough to upset the ballance to allow the cyano to grow. After a while, it should all come into check.

Have you tried the lights out method? I have used that in the past when I got extremely pesky outbreaks. Allways worked awesome for me. 3 days NO lights, blanket on tank, no food. Large water change after and do a light acclimation perios. couple hrs first day back, then longer, 3rd day back to full light schedual