Quote Originally Posted by t3chn06789
i dont know why the stems break and start dying

leave them next to the window to get some sun
You need more light - the seedlings are stretching for light, the stems elongate "looking" for light until they are too weak to resist the force of weight, resulting in a bent over seedling.

Once you have more light, I would transplant and bury the stem, leaving only about 1 - 2 inches of visible stem, the rest buried under soil. The stem that was buried will regenerate roots and the seedling will be more stable.

Looks like you'll have to some searching on these forums in the basic grow section to get an idea of how much light. (I would go the CFL route - cheap and easy).
:stoned: