i dont think they got ur question, or maybe i dont, but i put mine in 18/6 they day the cotyledons (first nodes) were decently sized (a third to a hallf inch). and to debate the 24/0 or 18/6 thing, 18/6 is theoretically better, because plants can build on themselves better when they are in the dark, but need the energy from the light phase. howeve i can not say ive seen one being better, cause ive only done 18/6. if u dont have a timer, then 24/0 will be fine i guess