yellowing on seedlings?

they are less than two weeks old, under 80 degrees, have decent moisture (i manually mist it with a mist pump), using tap water to water, im only using a 27 watt cfl but i figure it would suffice for the time being, yes i have a fan running but no method of Co2. can you please tell me what possibilities of the yellowing could be?

The actual leaves look okay, it's your cotyledon that is yellowing. Mine do that sometimes too. What kind of soil are you using? Also, I wouldn't mist them and make sure you are balancing your PH before you water and feed.

Joker is right. I just wanted to make sure you weren't giving nutes already.

MidnightJoker said:

The actual leaves look okay, it's your cotyledon that is yellowing. Mine do that sometimes too. What kind of soil are you using? Also, I wouldn't mist them and make sure you are balancing your PH before you water and feed.

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I couldn't have said it better myself