Chaeto lighting

I have read conflicting reports. How long do you light your chaeto in your refugium? 24 x 7? Alternate with main tank lights?
 
I have mine running the same as my actinics to the main tank... about 13 hours and off all night. I have read that they do need rest and shouldn't have lights on 24/7.
 
Mine run from 9pm to 10am - 13 hours opposite the display tank lights. Basically I have them and the moonlights on the same timer.
 
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