I don't think they are autos, and regardless of the fact that they are 36 days old, they haven't been growing or using the nutrients in those 3 gallon pots in that time, they've been clinging to life... but yeah normally at that age they need nutrients... I have no more advice, if they were mine, I'd have cut my losses by now.
@SunshineSupergirl I just went back and re read your journal... I think I know where it all went wrong. I know you think it was the Evian, but I just saw that you said you mixed in Rosemary and peppermint oil and some fungicide for a spray because you thought you had powdery mildew... I think it was the essential oils that burnt and killed them. Even in tiny amounts, Rosemary and peppermint are VERY strong oils, and also once you sprayed it on, it stayed on the leaves and cooked your plants with the light. Oils of any kind are very tricky under lights, and I would never recommend spraying anything like that concoction on seedlings. Full grown healthy plants at lights out, MAYBE, but even then. Seedlings can't stand up to that kind of treatment. Home remedies are great, I try to go organic myself, but just because it's natural doesn't mean it can't hurt your plants. I love that you're still holding out hope... maybe just keep them in an extremely long veg to recover if you're dead set on pushing forward.