ok so with out a picture its kinda hard to say.. N problems: too little =yellow leaves, while too much is dark green, but u already knew that didnt u, so lets move on to heat stress... in my medical opinion (i love saying that) it is litteraly based on how close u can hold the back of your hand to the lens. if u have a ton of air blowing through hoods, a/c, fans, etc., u can be pretty close. i have my babies up to six inches away during flower at times do to lack of time to visit the room, however with a heafty 10000 btu a/c less that 6 ft from the hood it makes for a pretty amazing little microclimate. are your tips brown crackly and dying, or worse has she gone limp? both could be heat stress.. hydro my friend, well i just dont go that way. its to unforgiving, for me. i do of coarse have a tester and from what ive found, transplanting a healthy female clone 6/8" with a devloped root system needs no nutes for the first week. i was killin em left and right... anyway holla