The plants look ok for two week dude,leaf curling can bee caused by heat or cold at night when lights are off,has for the light couloured plant i would have to say that if u have a look at the bottom of the pot the plant prob has a bigger root system then the others make a more stronger mix for this one.Week two they should be on 1.2 ec.Keep a eye on your temps look for temps around 25/lights on and 15 lights off,The minute my seedling have sprouted and the seed hits the top of the coco i add nutes this is about 4/7 days after germanating.To be honest they look ok ,,,,,,,,,,,,,,,,,,tyke