Rusty staff

[janos]

Hi to all .Need some help with some brawn rusty staff on the gravel. Cleaned every day and next day come back.

 

[Heliarc19]

Looks like cyano

 

[Heliarc19]

If it looks like a thin mat on top of the sand then it’s most likely that, some flow directed at it can help. You can also buy “chemiclean” or “red slime remover” but be sure to follow instructions and make sure there is plenty of oxygen in the water