Mini Hearth (Beige 3020) Fortress What does add a second

What does add a second side mean

4"x8"x4" Foraging Area

This formicarium is recommended for growing small to medium-sized colonies

This is a standard feature and no options are required to add this feature

***GLOW FORMICARIUM - This formicarium is coated with a special material that makes it glow-in-the-dark

Mini Hearth (Beige 3020) Fortress What does add a secondReady for Immediate Shipping, this Mini Hearth comes as shown in the photo on this page. ***Modular Design (for more information click this (link)*** ***Museum Quality Box Included w magnetic lid (+18)*** 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) Museum Glass optional ($8) Included with this purchase is a syringe for hydration,