Mini Hearth Type III (Terra 324) keeping ants 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

Medium/Large sized tunnels and chambers

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The side-foraging style for a double-sided would be mounted in the middle of the short-side of the foraging area while the single-sided Phalanx would be mounted on a short-side corner (see main photo)

Mini Hearth Type III (Terra 324) keeping ants I would recommend a mediumReady for Immediate Shipping, this Mini Hearth comes as shown in the photo accompanying this product. ***For more information on the Mini Hearth Type III, click the following (link)*** Nestmate this Mini Hearth ($5 value) comes with a nestmate (See photo). Museum Glass optional Included with this purchase is a syringe for hydration, Mini Hearth PDF guide (upon email request), nestmate and stoppers, lid, and magnetic glass panel. The New Modular Mini