Sickly Looking Plants...

My plants are about 5 1/2 weeks old growing in a closet setup. I have proper ventilation, a fan blowing to circulate and keep it mildly temperate, and enough lighting to suite the plants until I receive my prev. ordered HPS light that will arrive shortly. I am growing hydro using the wick system but my plants are all of this characteristic: they are growing full and tall except for the lower leaf sets which are sometimes brown, yellow, and curling downward.
I have nutes added to the water and at the right amount. Please someone help me to get my plants looking ENTIRELY healthy and not just the top sets of leaves...

dude, some pictures would help everyone help you...

Have you been checking the Ph of your water? I have never done Hydro but I know this is a key factor. Cuz the Ph must beower than in soil grows.

and yeah Pictures would help alot

kd_special

the bottom sets of leaves on plants die....they have nothing to do wit the photosynthesis process....so ive read.....but yea pics would help