1st dwc. Question/Problem

First off I'm sorry I cant include a picture, Im trying to get a hold of a camera because my cell takes the crappiest pics.

My 2 week old plant is in a 3in rockwool cube, in a home made dwc system, it was growing alright, but noticed some drooping of the leaves and some yellowing, Now I just moved it into a 500-600ppm nute solution last night, and no change in the plant.. Still the oldest leaves are yellowing some with a brown tip, and all the leaves are semi drooping. I don't know what it is..

Using 4 20w 75w equiv CFLs about 3-4 inches away from it. 24hours a day..

Can I still check the PH of nute water with the little coloring drops? Because the floranova made the water brownish, So wouldnt that effect the color?

I feel like im doing everything correct.. but im freaking cuz the drooping.. dont want it to die!
 
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