first true leaves yellowing at node

hey all, first I would like to say that this is an amazing site and I have learned so much from all your advice. This is my first post and need a little feedback on my babies. SO I have 3 white widow seeds growing, this is their 5th day above ground. im worried about one of them because it seems tobe very yellow at the node of the first true leaves. rest of leaf is green just yellow at start where node is. Also one of the cotelydons seems to have a yellow spot on its tip now. The other ones are all a good uniform green not like this one.

Medium: Soiless ProMix Bx
Lighting: not very good - 2 100w sylvania daylight light bulbs (waiting on leds to arrive)
fan blowing on the sprouts

Been trying to up Co2 with yeast and sugar, water when cup feels light. (Dont think its under/overwatered)

I know the lighting sucks atm, but could it be a nut def? Should I go ahead and transplant to 50/50 FFoF and Light warrior or is this yellow nothing to be concerned about. Thanks for taking the time to read looking foward to the discussion.
(pics arent uploading gonna continue trying)

finally got it to work. So here it is, Ive been looking for a while only thing I can think is N def or light bleaching possibly? or maybe nothings wrong and I need to sit back and blaze

Judging from the length of the stem and your lighting setup, my first guess is that it needs a lil more light. Low light makes it take longer for photosynthesis to develop in new cells. Doesn't look like it's in immediate danger, though.. I'd say your best bet is to just sit back and blaze.

They are shitty 2 100 w incandescent daylight sylvania socket bulbs. Im getting a DS100 led from advancedledlights they seem like they kick ass. Not coming in till friday tho. Here are pics of the other one for comparison tho, this one seems to be doing fine and its under the same conditions.

I'd wait til the next watering and use distilled water on the yellow individual. Each plant, even of the same strain, is genetically unique, so they will respond to the same conditions differently. Seedlings, being much more sensitive than a healthy, mature plant, exaggerate these differences.

Yea that sounds legit bro. Thanks for your help, this site has so many knowledgable people. Think im gonna start a grow journal on this .