Ok, I thought old bulbs caused cyano??? I finally got around to replacing my year and a half old VHO bulbs. I switched out a bulb every few days. Now I am getting very small patches of cyano. In 3 years of reefing, I have never had cyano. I'm starting to panic.... But, first I am mixing some salt for a water change and will test the water tomorrow. I am assuming this is from the new bulbs?