I have several darkling beetles, and one started acting weird, falling over, not moving his back legs. This happened to another beetle, who looked like he was slowly paralyzed from his back legs to his head until he died. Is this normal or am I doing something wrong and can I do anything to help my beetle right now before it gets worse ?
It's possible they've reached the end of their lifespan at similar times. Without knowing how long you've kept them or the source, it's hard to be sure, I've brought home desert darklings before and they lived for several months with what seemed easy care, and expired. You might try- BeetleForum.com for more information about beetles, it's free to join, not as populated as InsectNet, but it is a beetle oriented platform. Once an insect gets "sick" it's pretty much finished, unless the issue lies in the conditions it's kept in.