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With the lack of information provided there are just too many things that it could be to assume, can you provide more information about your grow? What are you growing in? are you using RO water? Are you PHing your water? are you using nutes too early?
wow... well, i used filtered water, standard high organic matter potting soil, and dont so any checking of ph... i thought it was important to get all technical to grow GOOD bud not just to keep em alive!
I second using PH'ed water, and keeping the seedling area warm (you can use a grow mat, but any warm area in the house can work, top of the fridge, top of the wifi router etc).
If you are getting a lot of stretch then you may want to lower your lights, or increase your wattage (ie more CFLs or maybe even looking at a T5 fluorescent light). Just keep and eye out for light burn.