Thanks Mike, I was truly amazed when I came in last night and saw the Cyano coming up in thick clumps after holding strong for weeks! I was worried at first because my orp tanked as soon as I treated the tank, but my polyp extention on the SPS got noticibly better.. Some things about this hobby are a true mystery! I don't care how much experience one has. Go figure! Joe B was really on to something. It looks like this stuff will stay part of my maintenance regiment. What's funny, is that I used SB to help cycle my tank 8 months ago based on a suggestion from Jeremy at Premium Aquatics. His words were somethig like, " this stuff works wonders!, but make sure your water is well airated". After cycling my tank I switched over to MB7, which seems to have done nothing in helping me with the Cyano.. even at higher than recommended doses. I'm really considering dicontinuing the use of MB7 and just use SB providig the results are consistent. I'll keep everyone posted as things progress..