NEWBIE! Yellow leaves! Feedback needed! (pics)

Hey everyone,

So I've been looking up yellow leaves online and I found a mix of answers: that it's normal and that it could be serious. They have been very healthy up until the last few days when this started.... and it seems to be getting worse. They also look to be kinda droopy, and I watered them yesterday after the soil dried out pretty good. Does anyone have any ideas of what I should do?

Also, I snapped some close ups of the stem even though I know it might be too soon to tell.. but can anyone tell if my one plant is male or female yet?

Age: 5 weeks old from seedling today
Each in 3 liter pots
Light: 4 100w CFL's, 18/6
Temp: 75-77F lights on, about 70 when lights off.
ph: between 6.5-7 (going to get ph down today just incase)
Fert: Fox Farm, 1tbs/gal every other watering (I water about every 3-4 days)

Thanks!!

u need some nitrogen! they look good tho... 1 more thing bring the lights closer. TIME FOR SOME LST!!

If fox farm is hydro nutes use it every watering at full str, they are N def and will only get worse. Also get a digital ph meter and make the feeds 6.5 no higher.

So I should get a fert that's high in nitrogen?

I had the lights closer but I moved them up a little because they stopped growing up, just wider. Theyre about 3-4 inches from the top of the plants. Move them back down you think?

Thanks for ur response

I was afraid to use at full strength, cause I read about burning them when they're so young. I'm giving them about 1/4 the suggested serving on the bottle, every other... Next time I water (prob mon/tues) ill give them 4 tbs/gal. Heading out to buy a digital reader now. I had a hard time with the dropper tester anyway, hah.

Just go 1/2 then full, if its hydro nutes you can use every watering with not a brown leaf tip in sight.

Awesome. Just bought some fert with 6.0% N. any thoughts on the sex? Or too soon?

Those are 5 weeks?..ummmmmmmm

Actont, something to add?