hey man, im also bout week and half into my ag grow, got 2 goin. ive got a post goin as well. and what are your lights at? i like a 20/4, but its fairly cool here and the water doesnt evaporate as much. however if its warmer where you are maybe too much light, or not enough water could be dryin her up. just cater to what u think she needs, looks dry? maybe just a bit too much light and change it up another hour of darkness.
also ive got the ag starter kit nutes which are the solid tabs, but i use about half of a tab dissolved in ph'd water when i do the res change, hopefully weekly, sometime week and a half cause i work and smoke too much lol, but i usually start giving nutes when i start raising the lights, 2-3 weeks or so, i gave mine a few crumbs of a nute tab i found in a little baggy. but prob not necessary yet.
take it ez
good luck! ill b reading