Prism Black is a modular ant farm built for keepers who want to follow colony life in fine detail without fighting fragile materials. The black housing acts as a high-contrast backdrop, so pale eggs and larvae stand out at a glance. At the heart of the nest lies G-23 medical gypsum, and around it the design brings together ventilation, escape protection, dry and moist chambers, and room for future expansion. This is more than a box for insects: it is a well-planned habitat where every detail serves the colony's comfort and the keeper's convenience.

PETG Housing

The structure is based on moisture-resistant food-grade PETG. The base, the layers into which the gypsum is cast and the black decorative trim are all printed from this plastic. Why move away from familiar materials? Layered acrylic and PLA have been used in myrmecology for years, yet both have well-known weaknesses: acrylic tends to develop microcracks where bolts are tightened and gradually warps from moisture, while PLA softens and loses its shape with even modest heating.

PETG avoids these drawbacks. It copes with constant high humidity, does not swell and does not absorb water, so the farm can be used together with a heat mat. The chambers are covered with transparent food-grade German plexiglass (acrylic) 3 mm thick, offering a clear view of every corner of the nest. All parts are joined with white nylon screws. They do not rust, which means no metal or corrosion products come into contact with the damp gypsum.

Specifications

Nest and dimensions:

• Overall size: 300 × 360 mm
• Module: 300 × 180 mm
• Arena: 300 × 180 mm, height 165 mm
• Gypsum: G-23 medical gypsum, 6 mm layer
• Height above gypsum: 15 mm
• Chamber height without gypsum: 21 mm
• Total chambers: 22, of which 10 contain gypsum
• Hydration zones: 2
• Zones separated by partitions: 6

Assembly and materials:

• Configuration: partially gypsum, Variant A
• Mounting: rigid coupling at 4 points on each side of the module and arena
• Hardware: white nylon screws that do not rust
• Materials: white and black food-grade PETG, food-grade German plexiglass (acrylic) 3 mm
• Arena with a double lid; arena and module fully dismountable, held by clips and screws
• Materials selected with the safety of living organisms in mind
• Suitable for most Camponotus, Messor, Pogonomyrmex and many other species

The model has been refined and improved many times, and work on its quality continues.

Air and Moisture

A nest of this size needs proper gas exchange. Pinpoint laser micro-ventilation in both the module and the arena provides a steady supply of oxygen, while the openings are made small enough to keep even the tiniest ants from squeezing through. G-23 gypsum forms the basis of the microclimate, and two hydration zones are provided for supplying water to the nest.

If you are planning a holiday, autonomy can be handled by additional solutions such as water tower farms and various internal water feeders. They keep moisture coming while the keeper is away.

Dry Granaries and Tall Chambers

In this configuration Prism Black is a classic partially gypsum farm, Variant A. Of its 22 spacious chambers, 10 are filled with gypsum and the other 12 stay dry. For Messor harvester ants this split matters a great deal: they store collected seeds in dry compartments, where grain is far less likely to sprout or grow mould. Within a single system the colony gets both a moist zone and dry granaries.

The second strong point is height. Chambers without gypsum reach 21 mm, so large species fit comfortably too. Camponotus carpenter ants often experience stress in low budget farms, whereas in Prism Black the queen has enough room to move freely and behave naturally.

Arena and Escape Protection

The integrated arena is fitted with a double lid. An anti-escape coating is applied to the inner frame, after which the clear central section can be opened calmly and the colony fed using both hands, while the protective barrier around the perimeter stays in place. The arena and the module come apart completely: they are joined with clips and screws, and rigid coupling at four points on each side holds the system together as one unit.

Insulation quality is one of the key criteria when choosing a formicarium: weak joints and gaps create a risk of escapes, so this aspect deserves careful attention.

Growing with the Colony

The module is divided into 6 zones by removable partition plugs, so the nest area can be increased step by step as the colony grows. A very young colony is easier to start in compact incubators: mini-modules with 10 mm gypsum. Once the colony has grown stronger, they connect to Prism Black through sturdy side mounts, turning the nest into a single expandable system.

Questions and Answers

Why PETG instead of acrylic?

Acrylic is fairly brittle and can warp under constant contact with wet gypsum. PETG is an impact-resistant food-grade plastic that does not absorb water. It withstands high humidity and mechanical loads without developing microcracks.

What does a 21 mm chamber height give?

In cramped tunnels a large Camponotus queen struggles to turn around and tend the larvae. A height of 21 mm gives the insects freedom for natural behaviour instead of forcing them to adapt to a low ceiling.

Why does the module have six zones?

A young colony should not be given access to all 22 chambers at once, as ants tend to turn empty compartments into refuse dumps. That is why the module is divided into 6 zones with plugs. When the colony starts to run out of space, simply remove one partition and the nest expands by exactly as much as needed.

Why nylon screws?

In the humid environment of a formicarium, metal oxidises and rusts, and the rust can penetrate the gypsum and harm the ants. White nylon screws neither rust nor rot, so the nest stays clean and safe for the colony.