What gives with a couple of my plants? Wrinkling on one and yellowing on the other!

I seem to be having problems with a couple of my plants but by far the biggest concern of mine is plant #2!

You can read my complete setup and grow journal here: https://www.rollitup.org/t/first-grow-6-x-fem-purple-kush-600w-hid-5x5x6-5-tent.849010/

Short rundown of setup:
- 5ftx5ftx6.5ft tent
- Carbon filter and high power fan
- Separate intake fan for tent
- About 300cfm moving through tent per minute at current fan throttle (3/4)
- 600 watt MH lamp with 6" cooltube reflector is 24 inches above seedlings.
- Soil is moist but not wet. Watered with bottled water kept at same temp as tent. once every day and a half roughly.
- Air temp @ 24C(75F)
- Relative humidity @51%
- 3.5 gallons pro-mix organic vegetable & herb mix with 4 cups of worm casting compost and 5 cups of perlite

Plant 2 problem:

Day 1 Sprout


Day 2 Sprout


Day 3 Sprout


Day 6 Sprout


Day 9 Sprout


What happened?! Is this genetic?


Plant 4 Problem:

Day 2 Sprout


Day 3 Sprout


Day 6 Sprout


Day 9 Sprout


Nitrogen deficiency?

Check out my complete grow grournal for more details: https://www.rollitup.org/t/first-grow-6-x-fem-purple-kush-600w-hid-5x5x6-5-tent.849010/

Any ideas on either of these plants?

Soil may be too hot for the little ones. I use seed starter soil for seeds and clones, I know they wont get burnt this way

Plant #5 seems to be a runt...

Day 1


Day 2


Day 3


Day 6


Day 9

Plants #1 #3 seem to be problem free and plant #6 is showing some yellowing at the tips.

Plant #1 (Day 9)


Plant #3 (Day 9)


Plant #6 (Day 9)

Yeah....soil is too hot. They most likely will grow in this soil but they will have all kinds of problems. Carefully repot them into some seed starter soil thats very wet and then let them dry out till next watering

I had a hunch the soil I was using was too hot for seedlings. I just moved plants 2, 4, 5 and 6. Carefully removed them from their current pots, making a 5-6 inch diameter hole in the existing soil and filling that hole with soil starter and put the seedlings back in. I guess we'll see what happens! better than waiting around for nothing to change and watching the problem progress.