Apex Yellow A is a compact formicarium with a vivid yellow base, square galleries, and separate humid and dry areas. Its 220×110 mm format keeps the nest easy to observe without requiring excessive space. Ants, pale brood, and movement through the chambers stand out clearly against the bright foundation, while the integrated arena provides a dedicated area for feeding and foraging.

A nest that expands with the colony

Rigid dividers split the residential module into three independent sections. A small colony can initially receive access to just one section. As the family grows, a divider can be removed to connect the next part of the nest. This staged arrangement keeps a young colony from occupying more chambers than it currently needs and makes unused spaces less likely to become cluttered.

Variant A uses a partial gypsum layout. Selected chambers contain a 6 mm layer of high-strength G23 gypsum, while the remaining rooms stay dry. The resulting moisture gradient lets the ants choose between humid nesting space and drier storage areas. This division is particularly relevant to seed-harvesting genera such as Messor and Pogonomyrmex, which can use the dry rooms for seed reserves while keeping brood in a more humid section.

PETG body and nylon fittings

The farm is made with PETG and assembled using white nylon bolts. Unlike metal fasteners, nylon does not rust when exposed to the humid environment around the gypsum insert. This prevents corrosion products from entering the moist substrate and makes the fittings practical for a partially gypsum-based construction.

Chamber clearance is 15 mm above the gypsum and 21 mm in the dry section. The available height accommodates larger ants as well as smaller workers. Species mentioned in the original material include Camponotus japonicus, Myrmicaria brunnea, Camponotus maculatus subnudus, Camponotus nicobarensis, Camponotus pseudoirritans, and Camponotus fedtschenkoi. Suitability should still be assessed against the actual size of the colony and the humidity requirements of the selected species.

Tall arena and controlled access

The arena is 80 mm high, creating a separate working area for food placement, maintenance, and observation. It is covered by a double acrylic lid. The two-layer design improves resistance to moisture-related warping, while mechanical sliding locks hold the access point closed. After feeding or cleaning, the lid can be returned to position and secured with the sliders.

Construction at a glance

• overall size: 220×110 mm;
• square gallery layout;
• three independently accessible nest sections;
• staged expansion through removable rigid dividers;
• 6 mm G23 gypsum in selected chambers;
• humid and dry functional areas within one nest;
• 15 mm clearance above gypsum and 21 mm in dry chambers;
• 80 mm-high arena;
• double acrylic top lid;
• mechanical Safety Lock sliders;
• PETG structure with white nylon bolts.

Questions about the layout

How do the dividers support gradual settlement?
Only one section needs to be opened for a small family. When the ants require more room, the relevant divider is removed and the next group of chambers becomes available.

Why are some chambers left without gypsum?
The gypsum section supplies the humid side of the nest, while the unfilled rooms remain drier. This gives the colony a choice of conditions and helps separate brood space from seed or food storage where appropriate.

What does the double arena lid do?
Two acrylic layers make the cover more resistant to deformation in a humid environment. Mechanical sliders keep it shut during normal use and must be secured again after access to the arena.