Only 1 of 6 misbehaving like this...diagnosis?

I'm vegging six bag seeds right now under four 40w tubes, 4 26w cfls, and 3 42w cfls. They are about 5-6 weeks in. One is a monster and the rest are coming along nicely and healthy...except one. This little one is having some sort of problems. I've noticed that more gnats are around it than the others so I suspect that may be the problem. I've been keeping the gnats in check with fly ribbon but I just bought some mosquito dunks for the next watering.

I also suspect that it may be a potassium deficiency since the leaves are a little papery and the edges are turning color. ANY advice would be appreciated! Thanks

id also like to add that i am growing in mg organic garden soil. the haters can hate but i add nutes very lightly and havent had any real problems with the other plants...

The one that behaved like that for me out of my 4 bagseeds was a male. That plant just looks stressed. Just keep it watered and you'll be fine. But yank it if you see male preflowers.

right on. thanks man, none have showed any preflowers yet but i will keep an especially close eye on that one....it should be mentioned too that i attempted to FIM this one. forgot to add that in there. that makes sense that it is just stressed then. whatever strain it is may not respond well...i moved the lights back just a tad and will keep watering. +rep

any other suggestions? anybody?