Labyrinth (1026 Black) Fortress 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

***This is a light brown sand interior (Vermiculite)

This smaller version of the Labyrinth formicarium

Small species sized chambers (+10)

A heating cable

Labyrinth (1026 Black) Fortress I would recommend a medium***This product is ready to ship. Ordering this product you will receive the exact formicarium in the photo.*** See the Labyrinth formicarium original product page here. Features: Dimensions 5x7" Nest (125mm x 175mm) and 8x4x4" Foraging Area (200mm x 100mm x 100mm) Decor Per Photos Medium Large Species size tunnels and chambers Water Towers 2 XL Water Towers Removable Vent (Optional) Museum Glass (Optional)