I think Bob raises a good point here. A minor cyano case can be controlled fairly easily. Maybe consider some minor tweaks, and as long as it doesn't actually start killing corals, don't worry too much about it. I had a small patch of it in the middle of my sand bed right up until I tore my tank down, and it never really grew beyond that spot. So I didn't worry too much about totally eliminating it.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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