What did I do wrong? pics

Hi, I desperately need help.
My box is 50cm x 50 cm x 120 to the lamp.
Lamp is in a cooled reflector, my temp. never rises above 28C (82F) and that is 5 cm beneath the reflector.
The lowest temp. with lamp off is 20C (68F). I'm fighting with my humidity at 40%.
Soil is this one (not mixed with anything): http://www.akvarijum.org/forum/upload/uploads/_270879996_url.jpg






My leaves started turning yellow on 18th. I have been watering her regularly. Only the big leaves are going yellow and it looks like its spreading from bottom.
Did not use any fertilizers and my water was always corrected to right Ph.

This kinda reminds me of the chinese fertilizer. Everything looks good in the picture. Is there any danger of pooling water under the plantpot? I found that when grown in plantpots mj "likes" to have the soil to the rim of the plantpot. What type of probe is that stuck in the soil?

You're watering it too much

It looks ok. What type of lamp are you using. Looks to me like its just not getting good light penetration. Could be overwatering like snafuu said, might want to give it a little N and maybe some Fe/Ca/Mg.

Sulfur (slight mag) and high ph, complicated by over watering/lack of dissolved oxygen
I would prescribe a small dose of Epson.........as always lol

Feed it , its clearly N def.

looks like over watering and lack of nitrogen. Water every 2-3 days when soil is dry.

When I see how dark the new growth on the sides is, I lean away from n and then I see the curled sides, banding and rosetting in pic 1 and the shape of leaves in second pic..with the also curled down leaves
Y'all disagree?

I did not use fertilizers and it's only 3 weeks old from seed so should not need any.
There is no water under the pot.
It's no probe, it's just a thermometer on a pencil .
I'm using 150 MH lamp.

qwizoking said:

Sulfur (slight mag) and high ph, complicated by over watering/lack of dissolved oxygen
I would prescribe a small dose of Epson.........as always lol

Click to expand...

This is probably the closest. I may have over done it with watering, and the runoff was a bit higher.
I dissolved half a spoon of Epson salt in 1L of correct Ph. And applied it by spraying yellow leaves up and under 30 min before the lights(26.2.).
Since then I have sprayed it a few times with clean water to dissolve the remaining salts.
I made a few more holes at the bottom of the pot and in the soil (a few small ones). Also pointed the fan at the soil.
I just hope the soil will dry up and the things are gonna be on their way.
I can't add any fertilizers as i think shes might be overwatered.