Dark leaves - possible N toxicity?

[Help_Needed]

Ummm.....how far into 12/12 are they?

The started 12/12 on Monday, so four days now.

I think you may well need a bigger container.

Yeah, I've done three plants in here without any problem, but I don't think I'm going to be able to do 6.

Help_Needed Reviewed by Help_Needed on 03-13-2008. Dark leaves - possible N toxicity? Ok, I've got kind of an oddball situation. I've got 6 clones in a DWC system sharing a common reservoir - you can see a pic here : http://boards.cannabis.com/hydroponics/151678-sog-gone-overboard.html. They've been growing fast and I've been gradually increasing the nutrient concentration, intending to push it as high as I can until I just start to see some nute burn, and then backing off. This morning I woke up to find that one of the six appears to be showing signs of nitrogen toxicity - Rating: 5