Mini Hearth (Grey 5501) Fortress This adds $20 to the

This adds $20 to the total price of the formicarium while adding on another 4x4" in nest space the colony can use as an expansion

Tiny/Small Species Chambers

$25 Upgrade

Glass Top (+$8)

a finely ground volcanic rock

Mini Hearth (Grey 5501) Fortress This adds $20 to theReady for Shipping, this Mini Hearth comes as shown in the photo on this page. Nestmates this Mini Hearth comes with a nestmate ($5 value) (See photo). For more information on this feature, watch this video ) Foraging Area Dcor (as seen in photo) Magnetic Ports for Expansion (Additional Mini Hearths Can be Connected On Each Side) Magnetic Glass Panels (Museum Glass optional) 2 Connection ports on each short side, Nestmate Ports in the back (3 8"