Whats wrong with my plant???

Ive got a closet grow room with 5 plants under (2) 40W plant and aquarium lights and (2) 40W full day spectrum lights. The plants all started at the same time and are different varieties. The tallest of my plants is about 17in. and the tops are getting kind of dry it seems and drooping a little. I started fert about a week ago with 20-30-20. but noticed the drying and browing prior to fert. I included some pics and would love advise. this is my firs grow. thanx alot

do you have pics?
what is your medium?
what brand of ferts do you have?
are you in flower? cause that is more of a flower nute
you need more nitrogen in the veg stage

have you checked your ph
if not then watch the ph video from Web Gallery Wizard™
in the streaming video section. link is on top left of page