Atrium (Aqua Blue 4162) Fortress we will contact you by

we will contact you by email or phone prior to shipping

The XL would give you a few more months of growing time and an additional nestmate

Foraging Box Size +50%

Glass Type (Standard or Museum Glass)

Atrium (Aqua Blue 4162) Fortress we will contact you bySee More Information About the Atrium at this link. General Information: *****Due to the size of the open chambers, this formicarium is considered a small to medium sized formicarium and can hold an estimated 1,000 to 2,000 medium sized ants, larger species such as Camponotus, Formica and Myrmecocystus up to 1,000 (again, approximately). While it is quite possible some small species (Lasius spp.) will do quite well in the Atrium, estimating numbers