Alright, here's another update. Despite the heat, I would say my babies are coming along quite nicely... except for a small problem. It seems like the first set of leaves are turning yellow and dying. Another symptom is that the tips are blackening, but mostly on the leaves that are turning yellow. So far, only two of my plants are showing this. It also seem to be happening to the bottom leaves. These are also not the embryonic leaves as those have already fallen off (Which I know is normal).

So could be causing this? I transplanted them into peat pots a few weeks ago and i used miracle grow as my soil, so I'm not giving them any extra nutrients. From what I looked up, yellow leaves are a symptom of lack of nutrients, but how can that be the case if I'm already using nutrient packed soil? Should I really add more nutrients? Let me know if more information is required. Thanks for any help you can give, I appreciate it

Here are a few pics.