What should this be set at?

[iplumbsome]

I cannot grow cheato, but I am producing plenty of other algae with this light in the refugium. I have tried it on a few different settings with no success.

I currently run it 12 hours a day.

 

[basement reefer]

Some plants need a longer photo-period to go into a vegetative state. Right now it might be trying to flower.

Do some googling on Cheato, but in the meantime turn the light a bit more blue, reduce the intensity and run it 18-24 hours. The the macro algae is small, so it's possible to kill it with too much light.

 

[vetteguy53081]

Go 18 hours and more towards the red side of colors and use some iron or iron/manganese. Chaeto need iron for stability