Biopellets are not miracle cure for cyanobacteria. Unless you have tank with mostly SPS and striving for ultra low nutrients system(ULNS) biopellets are not for you. There is a lot of misconception and bad advice about biopellets,mostly from people who used them for a while, and reported problems after using them incorrectly.Yes,there is a lot of unknown still,but if you follow few basic rules,biopellets work very well. I have been running biopellets for almost two years now,and I am very happy with results. I have mostly (90%) SPS tank with a lot of fish in my 120 gal.My NO3 and PO4 are undetectable ( salifert and hanna checker).Having good,oversized skimmer,feeding your fish and corals,keeping ALK close to NSW levels and using right amount of pellets in right reactor is essential in having success with biopellets. If you want to learn more or have questions ,shoot me PM, I'll be more than happy to give you more info.