i would choose the nutes you want and start with half recommended. if it doesn't effect them poorly (spots on leaves, sagging, wilting) try more if you like... Slight nute burn won't hurt. it will help you find a balance in your strain. problem is some girls don't like much. some will burn a little even with half doses. just make sure you get nutes from an online head shop or hydro store. not miracle gro or some home depot stuff. good luck oh yea... water when dry. i usually stick my finger into the soil. if it feels dry for more than an inch or so, water. you will get a routine down pretty quick.