Hey buddy great start! Here are some things i learned about the seedlings when starting out. When they were about the size of yours, I placed them under the metal halide bulb only to find out that it was probably too strong for them at first. I then just used some T5 fluorescents to get them going until they were big enough. This is what they looked like before moving them into the mh bulb (definitely dont have to wait that long but i would get it passed their seedling stage)
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Another thing I would add is that if you are going to use T5's then get em reallly close the plant, they love that and wont burn it.
The lime green thing seemed like it might have been too much water. I screwed up big time on my first grow by killing all my seedlings cause they DIDNT have enough water....i always read that was one of the newbie mistakes is over watering over watering overwatering so i didnt want to do that....but i underwatered LOL oh well. Since they are in cups right now, the best way to tell if they need water is to pick up the cup and feel how heavy it is. When you water it, it will get really heavy, and when its dry, you can feel that its soooo light and fluffy.
Let them dry out until you pick them up and notice how light they are.
Hope this helps and keep her going! got me subbed!