Prism Yellow is a large-format modular ant farm for keepers who take the hobby seriously and are planning for a sizeable colony. A nest module filled with G-23 gypsum and a foraging arena join into a single 300 × 360 mm system. Ventilation, moisture supply and a double escape barrier come together as a carefully planned artificial habitat in which every zone has its own job.

A PETG frame instead of layered acrylic

Many formicaria are assembled from stacked acrylic sheets or printed in PLA. Both have weak points: acrylic can crack if the fasteners are overtightened, and PLA loses strength when it warms up. This farm takes a different route: the base, the inner layers that hold the gypsum and the decorative yellow panels are all printed from food-grade PETG.

What this frame gives you:

• the plastic does not absorb water and keeps its shape even in a permanently damp nest;
• the body withstands knocks and mechanical stress without cracking;
• a heat mat can be placed under the farm.

The chambers are covered by clear 3 mm food-grade acrylic glass made in Germany, giving an unobstructed view of life inside the nest. All layers are held together with white nylon screws. Unlike metal ones, they do not rust in a humid environment, so no corrosion residue ends up in the gypsum.

Inside the nest

The module is divided into 22 chambers. Ten of them are lined with a 6 mm layer of G-23 medical gypsum, while the remaining twelve stay dry. There is 15 mm of headroom above the gypsum, and the dry chambers offer 21 mm. This partial-gypsum layout is designated “Variant A”.

How the chambers are used:

• humid chambers — for the brood;
• dry chambers — as storerooms and food stores;
• two hydration zones — water is added here to moisten the gypsum.

This mix suits Messor harvester ants particularly well, since they stockpile seeds that spoil in damp conditions. The extra height, in turn, solves the problem of large species: a Camponotus (carpenter ant) queen has enough room here to move around freely.

Expanding as the colony grows

Too much space is no advantage for a young colony — the ants tend to turn empty chambers into rubbish dumps. That is why plugs divide the nest into 6 sections. At first the colony occupies only part of the module; once its numbers increase, you pull out the next partition and open up new space without rehousing anyone.

When even the whole module becomes too small, the rigid coupling comes into play: the module and the arena lock together at four points on each side, which makes it possible to dock an additional Prism module. A very small colony is easier to start in a compact gypsum mini-module incubator, moving the established family into Prism Yellow later.

Air and moisture

The larger the farm, the more circulation matters. Both the arena and the module have spot micro-ventilation: fine laser-cut perforations let fresh air in, and the small size of the holes reduces the risk of escapes. G-23 gypsum is the main humidity regulator. If you are going away for a long time, it is worth adding a water tower and internal drinkers so the ants always have access to water. These are separate accessories.

Arena and escape barrier

The 300 × 180 mm arena stands 165 mm tall and is closed with a double lid. The inner rim can be coated with an anti-escape agent, and the clear centre insert lifts out so you can add food without fully opening the arena. The module and arena come apart completely: all parts are held by clips and screws, which makes maintenance easier.

Specifications by group

Dimensions

• assembled system — 300 × 360 mm;
• nest module and arena — 300 × 180 mm each;
• arena height — 165 mm.

Nest

• layout — partial gypsum, “Variant A”;
• chambers — 22, including 10 with gypsum;
• gypsum — G-23 medical grade, 6 mm layer;
• clearance — 15 mm above the gypsum, 21 mm in dry chambers;
• hydration zones — 2;
• sections with partitions — 6.

Materials and assembly

• body — white and yellow food-grade PETG;
• viewing panel — German food-grade acrylic glass, 3 mm;
• fasteners — white nylon screws that do not corrode;
• connection — rigid coupling at four points along each side of the module and arena;
• construction — fully demountable, clips and screws;
• arena — double lid.

Suitable species

The model suits most Camponotus, Messor and Pogonomyrmex species, as well as many other ants. The design has been through numerous revisions, and work on improving it continues.

Frequently asked questions

PETG or acrylic for the frame?

Acrylic is more brittle and copes less well with long-term contact with wet gypsum. PETG is impact-resistant, does not absorb water and does not crack under mechanical load, even at very high humidity.

Why 21 mm chambers?

Budget farms typically have chambers only 6–9 mm high, which is enough for small species alone. A large Camponotus queen feels cramped there, and cramped conditions are a source of stress. The 21 mm clearance leaves room for natural behaviour and brood care.

How do the six sections work?

A young colony should not be let into all 22 chambers at once — it will turn the surplus space into a dump. Plugs split the module into 6 zones: as the colony grows, you remove one partition after another and gradually open new chambers.

Why nylon screws?

Metal fasteners rust quickly in a humid environment, and rust can seep into the gypsum. White nylon screws neither corrode nor rot, so the nest stays clean for longer.