Cut down on feeding which raise the nutrients, also cut back on photo period, siphon as much away as possible, increase flow in the areas it is accumulating, cut the phyto back or IMO get rid of it completely, I would switch to a frozen food that you can rinse before you feed as David said the flakes are loaded with phosphates. Also do more water changes. Are you sure this is Cyano? If this is the case the above will get rid of it.
However if you have a diatom bloom which is the browner stuff that looks like cyano, it is caused by high silicates in the water. More than likely is from the tank being so young but could also be coming from your RODI. Simple way is to test the RODI for Si and if you get a reading you know what the problem is. If you get no reading of Si than you know it is just from the tank being new nd will go away on its own.