Adam, I roughly followed Har's advice from the club meeting a while back. I had a half inch of sterilized soil on the bottom of the bin, the seeds were laying on top of the soil and I covered them with sterilized straw. Despite soaking the seeds in full strength hydrogen peroxide twice, the first time 15 minutes the second time overnight, a blue cheese like mold covered the shell. The bins are sitting on top of a water heater for bottom heat.