umm whats going on

hey guys iv got a ghs lemon skunk going on her 4 week of bud,and here the prob ,she had the biggest full dark green leaves i have ever grown ,shes in soil i belive a mix of ffof and sum light warrior with a little guano here and their my buddy an old hippe gave me a foam ice chest full of it.. u know the kind that fits a 6 pk or so shes about 2ft mabe a lil taller indoor under a 250 hps the room is not that hot at all maybee 84 at its hottest,ok ok i kno what your thinking what the prob,well it was almost and over night thing the leave begame to get a rust color spots though out the whole plant well the water leave for that matter the buds and the new grow in side the buds still look nice but the leave are all getting thouse rust color spots and just the tips have a down ward curl, all she reseves is ro water no nutes and have ben doing great . well up to now what do u guys suggest it being alomst half way done? im thinking shes root bout cuz im a hydro gorwer and i got this seed from a freind so iv never really delt with the whole root boud thing any help would be great and sry for no pick i cant find the cord to go to the computer

have you tried some calmag in your water , you should be adding it if your using r/o water , also could be rootbound too

pics! Please!

May be root bound, more likely would be hungry. The soil it is in is cashed and she needs food. That soil will carry her so far. Good luck and good growing