Seedling Help please, brown tips / yellow color

Hey guys, this is my first grow and I think I'm in need of a little bit of help if you can

- Seedlings are 2 weeks old
- They are under 1 28watt CFL, 24/0 light cycle
- 1 fan blowing at the top of the seedlings, 1 exhaust fan, no intake fans but there is an air duct at the bottom of the box.
- They are in an organic soil mixture, It has a pH value of 5.0-6.5. 0.7 Liter Pots
- No ferts yet, just bottled drinking water.

There was a time last week where the air duct was blocked and it got a bit hot for a while, but thay was days before the brown tips showed up.

Since its my first grow i cant really tell if the color of the plants are off, but they seem a bit yellowish to me.


could you guys help me figure out whats wrong with these plants if you can.. Thanks alot!

Maybe it's a nitrogen deficiency. Maybe you are letting the soil get too dry between waterings. Maybe it's fallout from the heat. I think it may be a combination of all three.