Casita III ( Arizona Red 1) custom formicaria I would recommend a medium

I would recommend a medium sized nest for them because the chambers and tunnels for the Pioneer are larger on average than  some of our other nests

The simple design of a single

Small species formicaria require steps to insure there are no gaps in the nest

) Please note

The Phalanx formicarium

Casita III ( Arizona Red 1) custom formicaria I would recommend a medium***Casita Type III *** ***This formicarium is the exact one shown in the photos on this product page. Once purchased this product will ship in 2 3 business days.*** Please visit this link for full details on the Casita Type III formicarium. Features: Red Desert Sand Interior Red Exterior Desert Mountain Foraging Area Medium Large tunnels and chambers 3 levels White Sand Interior 2 Nestmates 2 sides 2 water towers Museum Glass Optional Add On Package