I currently have a small 5 worker colony of Formica subsericea. Their test tube is getting a little moldy, so I'm planning on moving them into a small container with some digging medium on the bottom. My question is, what sort of digging medium should I use? In the past, I've seen wild colonies nesting in sand, but many websites say that they nest in soil at the base of trees. What should I use? Thanks in advance!
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