In what form did you add iron?
That's a very bad N def, you may have locked yourself out pretty bad. I see something else going on with the coppery hue on some leaves. Like a toxicity.
In the other thread, the plants were already startign to look pot-bound- did you repot?
I thik you are going to have to flush heavily, check and adjust your pH if necessary (likely IMHO), and get going on a veg fert with plenty of N in it.
And repot!