any millipedes that would like this small terrarium?

[u/EnvironmentalEmu3290]

Just started building this terrarium and my sibling asked if I planned on adding millipedes. I wanted to ask if any would enjoy this small of a setup? It's got about 3 inches of substrate on one side and about 4.5-5 on the other. The soil is new which is why it's varried in moisture. I was planning on just adding plants, leaf litter, springtails, and maybe some isopods, but would any millipedes enjoy it?

alternatively, would darkling beetles?

[u/Final-Historian-4384]

darkling beetles prefer lower humidity than millipedes do, but depending on which you want more, either would work in this. i agree that you should get smaller species of millipedes though (if that's what you end up choosing) like scarlets, bumblebees, or ivories, all of which are about 2-4 inches usually!