Honestly if you want stronger plants, germinate the seed in whatever medium your planning on using for the grow...Sounds like the seed was maybe weak. Is it just bag seed? Anyways I have found the best way to germinate seeds is soak them in warm water for 8 hours, tap on them in a few hours as they should sink...(usually a sign the seed you have is good) afterwards plant the seeds in the medium you plan on using about 1/4 to 1/2 inch in depth. For best results put the seed on its side....In about a week you should see the beginning of a new plant.