What do you have in your tank for livestock? Given it's a new tank, I would probably opt for medicating your tank (to be fair-- many others will disagree). Siphon out as much of the cyano as you can, then dose your tank for 7 days with Maracyn (Erythromycin). Use the recommended dose and make sure to use it for the full 7 days (i.e., don't stop treatment when the cyano dissapears in 3 days--this is how bacteria becomes resistant).
Make sure to turn off your skimmer for the treatment period (it will go haywire otherwise). Also, remove any activated carbon you may be running. At the end of the treatment period run activated carbon for a day or two before turning your skimmer back on.
I've not seen a thread here or elsewhere where this approach ended poorly.
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