I had a very similar problem and it was definitely MG def., how long did you use epsom salts for? Did you put it in their water or foliar feed them? I ended up flushing with Clearex by Botanicare and putting it in the water. If the roots lock up, too much salt then you have to try and do it foliar feed, or flush it with something that will get rid of your locked up roots. I'm no expert and it might be N def, they look similar at times. But try foliar feeding them the Epsom salt, 1/4 teaspoon to a qt. And make sure the lights are out, it took me a good week before they started to show signs of recovery, are the newest parts of the plant still getting burnt and crispy? Like I said I'm no expert but it looks like it could be Mg def. Are the veins in the leaves still green? I'm not really sure though because for 30 some days they are really stunted, I have two week old plants bigger than that, so chances are the plant is not getting something. And another thing, I used some MG potting soil and they looked like yours. What nutes are you giving them? What kind, how much and when.

Well the browning leaves are nute burn where you've poured the feed in and it's hit against the leaves, under hot lights this burns the leaf. The reason they are so small is because of a ph problem. Your plants are not taking in the nutes because they are locked-out.

Sorry, only looked at the pic's. What medium, and what ph?

They are in a mix of Miracle grow potting soil, I added Dolemite lime, and some pelletized bat guano.
The PH is about 6.8

I don't think it's nute burn, because it began when they were still in the orginal container, in potting soil w/o any nutes, before I added any ferts.

Must be the MG soil. this shit holds a lot of nutes. You say it started before you added any nutes, and with normal ph, this is very strange.

When you measured the ph, are you talking about the feed or the actual soil?

But this doesn't matter if it started before you added nutes. It can only mean that the nute make-up of the mg soil is too much for your plants. They don't like it. a lot of growers experience problems with mg soil. It doesn't really add up in my mind, but it's the only answer left.

The symptoms started before you added nutes. Was the ph fine before you added nutes? Something's missing here. Have you got a soil ph tester?

I moved the cracked seeds into "plain" potting soil with no nutes, b/c I was afraid the lil' darlings would burn. I have a ph meter with a probe for soil, and also a kit with drops to test the water. The PH was always in the good range 6.5-6.8. I'm a novice, but I've read everything I can get my hands on, and I can't figure it out. They were rootbound for about 1 or 1 1/2 weeks I think, which my account for the size, but not for the leaf problem...

Ah, I think we're getting somewhere. root bound. Did you slice the bottom of the roots to allow them to grow into and fill the new container?

If you haven't then root bound means they will grow very slowly and most likely just strangle each other more when they do grow. If your plant is rootbound and you transplant without slicing the roots the plant will grow only as big as thwey would have in the original pot.

You need to take it out and slice the roots. wait till the soil dries out good first.

Ok, that makes sense. Do you think that the root problem would account for the problems I'm having with the leaves? I guess if the roots are strangled, it would have a hard time with nute uptake, and cause a deficiency. This is logical I suppose.
Let me ask another quick question...

As stressed as these plants have been I'm going to assume they will be Hermies. If I take a clone of an all female branch with no male flowers, will I be able to clone only females, or will all the clones Herm out as well?

Thanks SOOO much...

Yes, just slice the roots and you should see an improvement within days.

Why would they be hermies?

No, if you take even a fem' branch it will still be a hermie if you clone it.