What is this

[Davisc1293]

I've been getting this brown film I assumed was dynos and was just starting to clear up only to be replaced by 2 different types... one a stringy red and the other a dark gray? I tried to collect it into a pile and pulled a handful of sand out with it after rinsing in water it turned the water a dark brown and let me tell you it stinks. of course I had to smell it...

 

[vetteguy53081]

Cyano bacteria
simply siphon up, reduce white light intensity a little and add snails such as Margarita, nerite abd cerith which will help control;