leaves, weird color, curled up

hey guys my digital cam is outta town for the week, but my babies (4-5 wks old) leaves are kinda going green yellow color with dark spots looking brown, they look dark green around the vein looking parts of the leaves, just like a lighter green yellow, and im having some curling on the edge of the leaves, they are in soil, under floros, and i just transplanted them to a bigger pots today, theyve been growing extremely quick, and looking great, just these leaves are bugging me, i also had some assperillus mold b4 i transplanted, but ive heard thats not really dangerous to the plants, ill have pics up in a couple days, but till then, sound familiar anyone?

after reading a bit seems like i might have a mg deficiency, water around here should be pretty clean, i think 3rd best in usa. anyways im also watering every other day, every other watering using a 20-20-20 solution, and foiliar feeding daily.