Stag Beetles Can be kept in small containers, if no breeding is required. If you  keep your beetles in small containers, better to keep them individually or at least in pairs, male and female.  The aggressive males will kill other males and the same thing may happen with females: aggressive females may kill other females in a very small enclosure.  For big groups it is better  to keep them in large containers with lots of hiding places created by placing pieces of wood or bark on the top of the soil. The beetles spend most of the day time hiding underground, and often become more active in low light conditions. They will escape if they have a chance, so the box should be kept tightly closed, and a few pen-size holes need to be provided in the lid or the top part in the side of the container for better air circulation.

They feed well on banana or other ripe sweet fruits or beetle jelly.  They seem to like banana more, perhaps due to a high protein content. Some breeders believe that adults of these species require a lots of protein and add some yogurt into the mashed banana.  I feed them with my home-made beetle jelly