http://www.formicult...k-july-14-2018/

Yep. Put it in a small outworld with a test tube and they will eventually move in. I would try shining a light on the walnut and cover the test tube to make it dark.
Aphaenogaster cf. rudis
Tetramorium immigrans
Tapinoma sessile
Formica subsericea
Pheidole sp.
Camponotus nearcticus
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