Young Plants in bad shape

I hope someone can help. I little history.
12/1/09, took 8 cuttings. By 12/13, all rooted.
12/19, over fert plants with G.H 3-2-1, TDS 850 solution.
12/24, flushed plants with plain water. In bubbler with water level at bottom of pots.
12/29, added nutes, 3-2-1, TDS-300.
12/30, Shit, noticed new growth starting to darken on a couple plants.
12/31, went back to plain water.
Note, to this date, only one of the 3â?� pots has roots coming out of the bottom.
Pics, 1#, all 8 plants, I think two of them are not going to make it. Pic #2, close-up of plant Iâ??m worried about. notice the new growth on the has darkened.

What do you think is causing this?
Should I keep using plain water till I see roots coming out of all the pots?
Are there any additives I should put in the water?
Not too worried about bottom/old leaves, (should I cut them off?).
(pH 5.7-6. Temp=68-75, water temp= 68, humidity=10-25. Tap water TDS=70, DWC system. 160w floroâ??s)

Thanks for reading. Steve

hi coconut 123 I am no pro but I have had this prob before and just waited it out you might want to cut back on nutrients a little hope it helps. but you might want to look around in other forums there is a lot of help here I just started looking around and found a lot of knowledge floating around here.

wow they don't look healthy:(

Thanks danielshout, maybe I should post on a newsgroup and get some help.

too much fertilizer. NO fertilizer in first 2 weeks.