is the sprout in dirt right now or anything? when you germ seeds, the seeds dont need light, just a little warmth. if the bean is cracked you should plant it right away in soil or your medium of choice. you reallly dont need that seran wrap either if in dirt. all my seeds have done good in the past when i just plant after germ without any kind of dome on it. just make sure you water it just a little at each time. dont get it sopping wet. i use a garden spray bottle with the nozzle set on stream and give each potted seed like 5-10 squirts.