Crap. Yellow striped leaves on one, yellow veins on another

[Dictionary]

Hey all. I've been lurking for awhile and have hit my first issue that I'm not 100% sure about. I'm growing in soil-organic, 50-50 top soil and potting soil mix. Water as needed (I check soil dryness twice daily and water when the top couple inches are dry.) I water with plain water and general hydroponics grow formula. I alternate plain water and fertilized water. I use CFLs. My plants are 5 weeks old and about 2-3in from the light. The first plant is only the bottom two leaves that are yellow striped. The second plant went from beautiful green to yellow veined in 12 hours.
Sorry if I left anything pertinent out. The first one is my favorite plant so I hope it's fixable!

First plant:
293595

And this is the rest of the first plant:
293597

2nd plant: (as you can see the top and bottom are the areas most affected)293596

[Dictionary]

Forgot- ph of plain water is almost always 7. We water from the tap, usually let it sit for 24 hours. Treated water is about 5.5-6.5, pretty stable. We have an exhaust and circulation fan. 24hr light schedule as they are still in veg. No temp readings in the room but its not hot. I'd guess about 80-90 degrees max.