I'm on my first attempt and using a grow cabinet. My bcnl supplied grow manual says I should change the water in my reservoir once a week during flower. Right now (week 3 in flower) I'm having to top up the water almost daily because the girls are sucking it back that fast. Is this normal? Do I just have some extremely thirsty plants? Will it be like this right to the end? The plants look fanfuckintastic. Beautiful roots and still growing everyday. They are green crack seeds ordered from Amsterdam.