First signs of heat stress?

I've got two seedlings growing in my seedling box, a gutted pc case with 2 6500k cfls in it and a pc fan running for ventilation. The taller of the two is starting to show yellowing around the edges of the leaves and 1 of them is slightly curling up the others seem fine. The shorter of the two plants doesn't exhibit any yellowing on it at all. I doubt its nute burn as the seedlings are in a mixture of humus and manure with perlite added in in about a 2 to 1 manure to perlite ratio. The manure and perlite both have like .7 or some other fraction of a number of all the vital plant nutes added but I don't think that would be anywhere near enough to cause burn. Heres the single picture I managed to snap off before my cameras batteries died. They're charging as I type this so I should be able to get a picture or two more tomorrow.

What Kinda soil mix are you using? Looks kinda dry and harsh...you need to fill the pot higher w/soil tooHere is what helped me get my info on growing, watch the video at the top of the page
Growing Weed For Beginners

That soil mix is pretty 'hot' for seedlings. Get some big holes in your cup and flush it out well. Generally, you should hold off on a compost based mix until you are ready to start feeding as the 5th set of adult leaves is starting to show. You should be totally fine, but you DO need to flush that plant. Luckily, you've got all that perlite in there and it will be VERY easy.

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Originally Posted by M.B.A.

What Kinda soil mix are you using? Looks kinda dry and harsh...you need to fill the pot higher w/soil tooHere is what helped me get my info on growing, watch the video at the top of the page
Growing Weed For Beginners

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I told you in my post :-p Helps if you read the post as opposed to just looking at the title and the attached picture :-p

Ty for the flushing suggestion stinky, I'll get right on that.