Help with this algae or cyno

[Norwich Nano]

Hello I am running a Fluval 60. Have gone through green hair , then red Cyanobacteria and now have this lighter green covering that looks like the red cyno in terms of coverage on the sand bed. Tank is 6 months in with a couple of clownfish , snails and a shrimp. No corals currently. Stock light and pump plus a power head , media baskets with floss and carbon and media balls.
Any help you can give would be appreciated . Thank you

 

[Matt L]

It could be green cyano. I use a microscope to know for sure when in doubt. Turning the tank light off for a few days may help too. Since this is a fowlr tank, you don't need to worry about harming coral with no lights, or using chemiclean, as directed, if required.

 

[Norwich Nano]

It could be green cyano. I use a microscope to know for sure when in doubt. Turning the tank light off for a few days may help too. Since this is a fowlr tank, you don't need to worry about harming coral with no lights, or using chemiclean, as directed, if required.

Thank you for your input that all makes sense.