I don't know man, that looks kind of small but then again I don't know what your light schedule is, how many lights, etc. Looks healthy but a bit stretched.
Nah, definitely go 24/0 for a week, and then switch. Make sure you keep them the perfect distance away, with height restrictions stretching plants is the last thing you want. Are you going to implement any kind of training? :bigjoint:
Hey man, what kind of soil are you using? Miracle Grow All Purpose Compost? I'm not sure if that has nutes already in it, but if it does then don't feed. You will burn the shit out of your plants lol
Would something like this work for a micro grow?
http://www.walgreens.com/store/catalog/Fresheners/Solid-Air-Freshener/ID=prod2505942&navCount=1&navAction=push-product?V=G&ec=frgl_&ci_src=14110944&ci_sku=sku2505379
I'm pretty sure I read somewhere the lowest the temps should go is between 50-55º, not too sure though man. you might have no worries, but look it up just incase