i had a horrible case of cyano bacteria and i was scared to treat my tank with any meds. so i did some research on the chemicals out there that attack cyano bacteria.. i found that the best that i tryed was the
poly-ox red slime remover was the most effective on the tank.
it was gone is about 2 weeks you just have to be patiant!!!
it dose make nitrates go up a bit because of die off of the bacteria but run your protien skimmer and do water changes and it willl be fine
i have been free of cyano for about 8 months
hope it works out for you
cheers
dave