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They are stretching because your lighting is insufficient. What sort of lights are you using, HPS/MH or Floros? If you are using florescent lights, tubes or CFLs, you want to move them down so they are about 2"-3" from the tops of your seedlings. If you are using a HID system, you have to be more careful because of the risk of burning your seedlings. About 16"-24" from the tops is usually OK with a HID system, but you gotta keep an eye on them to make sure you don't burn them.
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