Undercrowd

It is hard to set numerical limits on the size of classes, but it is certain that conditions in California tend to overcrowd rather than undercrowd.

The number of flies placed into the vials on the fourteenth day was approximated; i.e., an attempt was made not to overcrowd the vials but yet not undercrowd the vials (in order to promote egg retention).

The steps to maintaining these criteria are simple; undercrowd, underfeed, properly filter, and do regular maintenance (in particular water changes) regularly.