cyano is a form of algae (debatable), blue green if I'm not mistaken and it takes both nitrate and phosphate to grow as do all "plants" Because the tank is new, my advice FWIW, is to keep siphoning it off till the nitrifying bacteria can get established in the rock. Growing algae in a fuge is the best means to starve the cyano. vodka dosing with a good skimmer should also do the trick but it all takes time. I had an outbreak at around the three month mark and it took weeks of siphoning five gallons at a time every two days. I used a two foot piece of hard clear plastic pipe with four feet of vinyl pipe attached around 3/8" thick to pinpoint the siphon where you want and not get too much water. Siphoning off is exporting unwanted nutrients rather than killing it to fuel other outbreaks of different nasties.
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