Scott, I think what happened with your biopellet experience is that you were using too many for the amount of available nutrients. That's what I find causes cyano with biopellet use. Discussions with some very experienced professionals seem to come to the same conclusion. The amount of biopellets used needs to match the amount of nutrients available for the biopellets to feed on. Since your tank is so new and you have such massive nutrient reduction equipment already in place, it is possible that 1/2 cup of biopellets would be too much. In my 90-gallon SPS tank I used fractionally less biopellets than was recommended - any more and I would get cyano growth.
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Originally Posted by Reef Pilot
Well,... there is a simple sure preventative for cyano. It's called MB7
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I've tried MB7 additions for cyano, and I've never seen any reduction in cyano. I know lots of people report success, but it's far from a "sure preventative".