Hey Perc
Cyano wont kill fish. Its ugly, and can be a pain, but other than that, its pretty harmless. If left unchecked it can overgrow sessile inverts, but if you syphon it off (you do have a turkey baster, dont you?), and watch your feedings, and skimm you can knock it out. There are products out there to kill cyano, and they work. The problem is they are antibiotics, and like all antibiotics, bacteria can come back tougher, ao then you have super cyano. Your best bet is syphoning and skimming. You can also drip kalk to expedite the process too if you like.
Just curious, what is your make up water source, and what is your phosphate level?
HTH
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Scott
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