XL Pioneer XL Bundle(Black 1309)(20 inches wide) Fortress Although it has been reported

Although it has been reported that this food supplement is sufficient for some species of ants as a stand-alone diet

and a plan for heating

but assume Large would still be best "classification" for design

the ventilation is helpful as the colony approaches capacity in their formicarium

XL Pioneer XL Bundle(Black 1309)(20 inches wide) Fortress Although it has been reportedThis is a Black Friday Cyber Monday Formicarium This XL is 4 inches wider (adding 25% more room) than the standard Pioneer XL. (No upgrade fee for this package Normally a $75 Upgrade and 25% off for Black Friday but 100% included as part of this bundle.) ***This formicarium comes with a free Mini Hearth of your choice. Please detail specifically what you would like, including model (Standard size, XL, or Bifurcated), color, and decor in the comments