Regarding beetles...
When the beetles appear, you need to organize a container for reproduction.
First, you should pour sawdust and oats into the container in approximately equal quantities. You should also install some snags or different pieces of bark in which they will lay eggs and hide. Then put the beetles in the container. The beetles should be sprayed often, but little by little, to create 60-70% humidity. The temperature should be 77-82 degrees.
You should feed the beetles with juicy food, one carrot or apple is enough for them, but the more varied it is, the better. You should feed them often, but in small portions, so that the food does not get moldy. Then, in a week or two, live larvae will appear.