They are not getting enough light. Are your grow lights further than 2-3 inches?( 4 inches if your light puts out heat) I also think you didn't put them under the light soon enough. They needed to have the plastic off as soon as you saw the very first seedling making it's elbow out of the soil, and they needed to be put under close grow lights as soon as the first seedling started to elbow up.
They look healthy enough, just transplant super deeply as soon as they get that first set of true leaves and the start of the second. And for right now, get them as close to your grow lights as the light(or heat from it) will let them get.
Also, don't forget to move the light to keep it the right distance as described above, while they get larger.
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