You want to keep an eye out for signs of burning, droopy/sagging all of a sudden, stop/stunted growth, anything that makes you think Hmmmmmm, something is going on here....The earlier you spot something going wrong, the easier it is to remedy it.
You can go to 18/6 whenever you want, the fan is a personal choice, I like to leave them on 24/7 so the ladies always have some fresh air blowing on them.
Yes you can combine nutes for feeding.
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