Once you see roots poking out and a noticeable paling of the older growth, you can give your clones a VERY weak foliar feed with a complete fert. I actually like to use the GH micro, since it has N [1] as well. Be certain to harden them off slowly. I'd separate clones of different ages in their own domes because while the rooted one needs a gradual decrease in protectin from dryness and drafts, the younger ones need steady humidity and no pestering. 24/0 light, don't open the dome unless ya have to, only mist when you see actual wilt, keep away from drafts and avoid temp swings.