lightening of leaves / bottom leaves dying? disease, no nutes, or too much light?

I had a 3 inch clone given to me 3.5 months ago in the bottom of a 2 liter soda bottle. I left it outside, and forgot about it. It didn't grow, became stunted, became dry, and suffered from barely any soil. Then 1.5 months ago I repotted it and watered it properly.

The clone was 3 inches tall, and it started to bud due to lessening of natural sunlight. I decided to stop the budding as they were tiny and changed her light schedule to 24 hours indoors.

It is now indoors under CFL's, semi dry 40 % humidity, and 80 to 90 degree temps, and 24 light hours to make her reveg. She is in a store brand organic soil enriched with nutrients. No other liquid nutes added yet.

It is working, she is getting new growth. Now, just a bit concerned about the light color of her new top leaves and rapid yellowing / drying of the bottom leaves. I think it might be because she is adjusting to her upgrade to 24 hours of bright (9000k total lumens) at from (medium 6000k lumens). First picture was taken 10 days ago and I circled the dark leaf for comparison that is now yellow in second picture


P.S. spider mites are gone, neem oil at 7 day intervals worked great. Still can see damage though.

just old age and spider mite damage. I'd clean them out, they are'nt doing any good and shading healthier leaves.

If I were your plant, I would kill myself. Haha. When in doubt, flush it out, then add light nutes for the final gallon or two. That's what I'd do.

p.s. Those temps are too high to go along with that humidity. Bug haven.