Hi and welcome to Canreef. Sorry to hear about your cyano problem - I think most of us here can relate to having had this same problem in the past.
You don't say how long your tank has been set up but if it is new a cyano outbreak is not that uncommon. However even in a new set up it is being fed by something - usually phosphates so the trick is to find out where the phosphates are coming from. Lighting can also play a role in fuelling this stuff. If you are leaving your lights on for too long or if your bulbs are old this can fuel it.
IME the usual culprit is either overfeeding or feeding foods such a mysid shrimp without rinsing it first.
Soooo with that being said I would suggest cutting back on feeding and light time - rinse any frozen food before you feed it - Use only RODI water - get new light bulbs if your are old and keep doing regular water changes siphoning out as much of the stuff as you can. If you have any sponges in your filters (or anywhere else for that matter) either rinse them daily in RO water or just ditch them.
You can use a chemical to get rid of cyano but unless you identify the source that is fuelling it in the first place it is just going to come back.
Hope that helps some.
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