i doubt tap water did that to your tank im using the same stuff you are and so are lots of people..youve been a reefer for alot of years murray so when you say youve never had cyano before i believe you and know that you do your homework....with that being said the cyano i believe was a hint....probably havent tested in a while because everythings good right???
did you notice any of your fish missing before the cyano is it possible something has died or spawned and the red slime remover just made it worse??

