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84f is a bit hot for a seedling and 46% humidity is a bit low, they really can't take the stress of it yet. For a seedling, ideal temps are around 78f and 60-70% humidity. With the Mars lights, I'd run them about 36 inches on the lowest power setting, seedling don't need a lot of light. Tier the intensity of the lights up as the plant gets bigger.

Sorry I didn't notice before. You are using micro, which makes boron deficiency almost impossible. You need calmag. Easy peasy. Go buy a calmag supplement for your hydroponic setup or look up how to use Epsom salts in the meantime if you have to wait for delivery.

Again, that's a very rare deficiency to have. It looks like your problem started at the bottom of your plant. This means it's a mobile nutrient problem: nitrogen, potassium, phosphorus, calcium, or magnesium. Boron, sulfur, iron etc are all immobile nutrients so the problem starts at the top leaves. You are using Floramicro, so you shouldn't have micronutrient problems. Always mix micro into your nutrient solution before gro or bloom. Dissecting your journal, I notice you have no calmag supplement. Calmag are vital for your plant to live. Looks like you have a calcium and magnesium deficiency. The problem starting at the bottom supports this conclusion. Get some calmag, I recommend CALiMAGic @ 5ml/gal. If your journal is accurate, I am 100% sure this is your problem. Good luck.

The damage was done by a mite infestation