So i have a big problem. I have some plants in pots inside and they're not doing very well. I thought the problem was when they got burned by high temps in the box, but not i'm starting to think it's a nute deficiency or burn. Could you guys take a look at my pics and tell me what you think?

The pics are all of one plant, but the others look more or less the same. Some are worse some are better, but i'm worried that i'm gonna lose these guys.

Help!