Red algae spots on sand please help

[Garrettgomez55]

So I noticed that my sand started getting little red spots on it. I think it might be cyano bacteria but it isn't slimy and it isn't on my rocks just sand. Any help would be great.

 

[thegrun]

A picture would help a lot!

 

[Sk8r]

The red blush is usually cyano. It can get thick, dark, and have bubbles. If so it's bacterial, not an algae, treated by turning lights out 3 days while running the skimmer aggressively. Doesn't always get it the first go, (do it once a month) but eventually will take care of it.