Seedling has yellow leaves !:( please help

Currently have four 4 days old seedlings under 600 HPS and have an exhaust sucking air from the fixture so the room stays at a temperature of 80 F.
The largest seedling's leafs started turning yellow. I read that it might be because i was misting them or over watering them so now I'm keeping an eye on the soil making sure its just moist .
Also lifted the light 4 inches higher so now the light are 22 inches from the seedlings.
Could it be nitrogen deficiency?
Could somebody please help me and yes this is my first grow .
Also , made a mistake and planted them in fertilized potting soil so could it be nutrient burn.

Post a Pic

Ringsixty said:

Post a Pic

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I couldn't so i used tiny pic

http://tinypic.com/r/212bl10/8

Over watering would do that.

Ringsixty said:

Over watering would do that.

Click to expand...

Really ? Thats all over watering ?
What should I do now?

stop watering, it will bounce back. Try not to obsess about everything. I usually for like 4 or 5 days between watering seedlings.

jcurtis912 said:

stop watering, it will bounce back. Try not to obsess about everything. I usually for like 4 or 5 days between watering seedlings.

Click to expand...

So I just need to stop over watering them ?

yes stop watering them and if you are feeding, stop giving them nutes. Wait until the soil is dried out, and i mean dry, before you water again

Looks like the soil is a bit hot and burned it.