Cyano has nothing to do with your salt mix. Cyano is from numerous things, but I have found 2 that are the most common.
1) Clean up crew. You should have either a sand sifting goby, numerous hermit crabs, snails, etc. to clean up and turn over the live sand. If you don't, naturally, algae and bacteria will build up on the sand because it is not moving and is under your light source.
2) Overfeeding, Dirty Sump, etc. Refer back to number 1, but you should have a powerhead (cheap one is fine) in your sump to blow around the build up that accumulates inside. The reason I say refer back to number one, this also is either due to poor husbandry, not enough water changes and suctioning the dirt out, etc.
Cyano is not a mystery and it is not the salt. Of any kind.