I had started a colony of b. dubias on October 1st. I use a 18 gallon rubbermaid container with an opening on the lid w/ mesh about 14"x6" for ventalation. I was expecting to get 450 roaches(150 adults & 300 assorted nymphs), but the website i ordered from had a double your order sale and ended up with over 1000 roaches(300 adults and 720 assorted). I had some freebies thrown in as well. Anyways the past few weeks i have noticed a rotting smell comming out of the colony and have been finding about 30 dead nymphs every week or so. I have not seen one dead adult yet, and just about every death is on its back. I used to have a heat lamp, but i removed it because i thought it might be contributing to the problem. After removing the lamp the deaths have continued. I know there can be many factors involved, but does anyone think i have overcrowding? If so does overcrowding result in nymph deaths? Any advice would be appreciated. Thanks!