Been fighting a cyano outbreak for about 2 months now. I've been peeling it off the sand and rocks, sucking it out with a turkey baster, everything I can think of to get it out, and it always comes back within a day or two. Nitrates are zero, phosphates are zero. After reading through this thread I decided to give the Natural Reef Red Slime Remover a try. As hesitant as I was to add chemicals, I have to say I'm shocked and pleased.
Within 3 minutes of adding the recommended dose of the Red Slime Remover, the red coating on the sand started to fade. After about 10 minutes, there has been a significant reduction in the coloration and it looks like my sand is starting to look like sand again. I'll follow up later tonight (before the lights click off) and again tomorrow to say how well it's progressing. So far it seems like money well spent. I'll be checking my pH tomorrow, just to make sure that's okay, but I don't have any way of testing O2 levels. So far none of the fish or inverts seem to be freaking out, so hopefully it's as safe for livestock as it claims.