Looks like a lot of stretch, so light may be too high. I see aluminum foil taped up, and the area does not seem very bright so this may be a CFL grow? If so, the lights should be 1.5-2" away from the seedlings. Some look pale in color so maybe a chance of over watering.
These are only guesses based on the pic. If you can give more info, we can provide better help.
Hello its always nice to have someone new. Everyone calls me smokie. As the guys saod above we need some more info for us to correctly help you. IT is always best to give as much about your grow as possable as je3z gave you some qustions. Always make sure you answer those because how to fix a problem under a t5 is alot different then if you were using a metal halide. Hope you can post some more info soon. Happy hemping
Smokie
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