I got some of the red slime remover (chemiclean) from the LFS but is hasnt helped at all. Its been in almost 48hrs my slime looks the same.
You may not have "cyanobacteria". There are many different types of coralline algae and some looks a lot like fuzzy red stuff. If you used the "red slime remover" according to directions, i.e.: removed carbon, turned off protein skimmer and UV then it should have turned brown and started dying off within 24 hours. My complaint on the stuff is so small an amount to dose 300 gallons makes for very difficult measuring.