An ant farm, or formicarium, is an artificial enclosure designed to house a colony of ants in captivity, replicating the conditions of a natural nest: brood chambers, controlled humidity, and darkness. It's usually made up of a nest, where the colony lives, and a connected foraging area, where the ants look for food.
AntMaster manufactures this range in Spain around the idea of modular design, in-house production, and a keeper-first mindset: each piece is designed to connect with the others rather than be fully replaced as the colony grows. For a first colony or a freshly fertilized queen, the usual starting point is the Starter module from the Terra range, which is later expanded with connectors instead of being replaced. That system logic, more than any single product, is what's worth understanding before buying your first ant farm.
Last updated: September 5, 2026.
What is an ant farm and what is it for?
An ant farm is the artificial habitat where a colony of ants lives, breeds, and stores reserves outside its natural environment. It replaces the underground nest: it offers dark, humid chambers for the queen and brood, and lets the keeper observe the colony's behavior without disturbing its conditions. It isn't a simple container: humidity, partial darkness, and chamber size directly affect the colony's health, its growth rate, and whether the queen feels safe enough to lay eggs. A poorly sized ant farm, or one without humidity control, can cause stress, fungus, or brood mortality. That's why, before buying, it's worth understanding what types exist and what the colony you're going to raise actually needs, beyond looks.
What types of ant farms exist?
Ant farms are mainly divided by the development stage of the colony they're intended for, and by their format. There are starter modules, designed for a fertilized queen or a microcolony of a few workers, with small chambers to avoid empty spaces that cause stress. As the colony grows, you move up to medium (M), large (L), and extra-large (XL) formats, with more chambers and greater interior volume. There's also a distinction between horizontal format, the most common, and vertical format, which makes better use of narrow shelf spaces. In AntMaster's Terra Ant Farms range, this translates into the Starter module, the M, L, and XL modules, and their vertical and evaporation variants, each designed for a different stage of the colony's development.
Plaster, acrylic, or 3D-printed ant farm?
The interior material determines how humidity is managed, and there's no perfect option here. Antifungal plaster, used in the Terra range, absorbs water from the reservoir and passively distributes it throughout the nest, creating a stable microclimate with little maintenance; in exchange, it's porous and can degrade or stain over time if the refill water isn't clean. PLA-printed ant farms with sculpted galleries, like AntMaster's 3D line, don't absorb humidity on their own: they depend on the reservoir and evaporation, so they need more attention with watering, but they're more resistant to impacts and easier to clean thoroughly. Clear acrylic is used in both cases only as an observation lid, not as nest material: ant farms made entirely of acrylic with no absorption system, common in generic catalogs, are cheap but lose humidity very quickly and require refilling almost daily.
How do I choose the size based on my colony?
The size of the ant farm should match the colony's actual size, not anticipate it. A Starter module, about 5 × 9 × 3 cm, is designed for a fertilized queen or a microcolony of a few dozen workers, and costs around €16-17. When the colony grows to a medium size, an M module at 11 × 11 × 3 cm (approx. €36) offers more chambers without leaving empty space. For colonies in advanced growth, the L module, at 22 × 11 × 3 cm, doubles the hydration system and costs around €60. Large colonies or advanced setups benefit from the XL module, at 23 × 23 × 3 cm with 25 mm of real interior depth, for around €111. Buying a module that's too large from the start doesn't speed up the colony's growth: excess empty space tends to generate more stress than benefit, and it's better to expand when it's actually needed.
What is a modular system, and why does it matter?
A modular system lets you connect several ant farms, foraging areas, and extensions to each other using connector pieces, instead of replacing the whole setup every time the colony grows. In practice, a Starter module bought in month one keeps being used as a secondary chamber later on, when an L module is added via a connector. AntMaster makes specific pieces for each type of connection: connectors for rigid tubes, 12/10 flexible tubes, ventilation, blind connectors to close off unused outlets, and vertical connectors for building upward. Those who'd rather not add loose pieces one by one can start with the combined kits, which include a nest, foraging area, and connectors in a single purchase. The economic advantage is clear: instead of discarding a €17 ant farm when moving from a microcolony to a medium colony, it's reused as an extension. The downside is that it locks you into a single connection system, so it's worth checking compatibility before mixing brands.
Nest and foraging area: what's the difference?
The nest is the humid, dark zone where the brood and queen live; the foraging area is a dry, lit space that doesn't need high humidity, where the colony goes out to look for food. Mixing both functions in a single module is one of the most common causes of mold: if the ants store food scraps or insects inside the humid nest, decomposition contaminates the environment where the brood lives. A connected foraging area, like those in the Foraging Areas range, solves this by physically separating the feeding area from the brood area, and it also makes cleaning easier, because leftovers are removed from a dry space without having to open the nest. Practically no experienced keeper maintains a colony with just the nest module: the foraging area, even though it's sold separately, stops being optional as soon as the colony starts eating regularly.
How does an ant farm's hydration system work?
Most modular ant farms are hydrated through a refillable reservoir, rather than by watering the plaster or plastic directly. In evaporation modules, like the TerraStart, a built-in 10 ml reservoir releases humidity gradually without needing to open the module. For drinking water, instead of internal feeders that soak the substrate, there are external feeders with a Twist system, with a removable 20 ml reservoir that's refilled or cleaned by twisting it, without touching the inside of the foraging area. For species with large mandibles, there are reinforced-access feeders with a smaller reservoir. Refill frequency depends on the reservoir size, ambient temperature, and the species being kept, so it's best to check the level every few days rather than relying entirely on a fixed schedule.
What accessories do I need besides the ant farm?
An ant farm alone, without accessories, rarely covers a colony's needs beyond the founding stage. Connectors are essential as soon as you add a second module or a foraging area. Foraging substrate, whether natural sand with clay, volcanic rock, peat, or coconut fiber, adds texture and absorbs humidity and debris, keeping the foraging area from looking or smelling bad. A feeder, external or built-in, handles hydration independently of the nest's humidity system. And although it's not strictly an accessory, it's worth setting aside a budget for spare parts like stoppers or anti-vibration softpads, which come included in kits but are worth having extra of if you expand the system later on.
- Connectors: for rigid tubes, 12/10 flexible tubes, ventilation, blind, and vertical.
- Substrates: natural sand with clay, volcanic rock, peat, and coconut fiber.
- Feeders: external Twist system (20 ml) and feeder for large mandibles (5 ml).
What mistakes are made when choosing your first ant farm?
The most common mistake is buying a module that's too large for a newly founded queen or microcolony: excess empty space makes it harder for the colony to maintain stable humidity and temperature, and can generate more stress than a properly sized module. The second mistake is buying only the nest and leaving the foraging area for later, which usually ends up with food scraps piling up inside the humid module. The third is mixing connection systems from different manufacturers without checking compatibility, which leaves the ant farm with no way to expand when needed. And the fourth, less obvious one, is choosing the material without thinking about real-world maintenance: plaster needs less watering but more care with the refill water, while 3D-printed material needs more consistent attention to the reservoir but tolerates impacts and thorough cleaning better.
Frequently asked questions about ant farms
What exactly is an ant farm?
An ant farm, or formicarium, is the artificial habitat where a colony of ants lives in captivity. It reproduces the conditions of a natural nest through dark chambers, humidity controlled by a refillable reservoir, and, usually, a connected foraging area where the colony looks for food without contaminating the brood zone.
How much does it cost to get started with an ant farm?
A starter module for a queen or microcolony costs around €13-17 depending on the material. To that price you'll need to add, later on, a foraging area (from around €16 in mini format) and a connector or two, so the real initial outlay usually falls between €20 and €40 buying piece by piece, or a bit more if you go with a combined kit.
Do I need to buy the foraging area separately from the nest?
Yes, in practice it's almost mandatory as soon as the colony starts feeding regularly. The nest is a humid space meant for the brood, and storing food there encourages mold. A connected foraging area keeps feeding in a dry, separate zone, which is also easier to clean.
What's the difference between a plaster ant farm and a 3D-printed one?
Plaster absorbs and distributes humidity passively from the reservoir, with low maintenance but some risk of deterioration if the water isn't clean. PLA 3D printing doesn't absorb humidity on its own, so it depends more on manual watering, but it withstands impacts better and cleans thoroughly with ease.
How do I know what size ant farm I need?
The size should match the current number of workers, not the number you expect to have in the future. A microcolony needs a compact starter module; a medium colony, an M module; and only once space starts running tight is it worth moving up to L or XL, expanding via connectors instead of replacing the whole system.
What is modularity, and do you have to pay for it from the start?
Modularity is the ability to connect modules, foraging areas, and extensions using connector pieces instead of buying a new ant farm every time the colony grows. You don't have to pay for it all at once: a starter module bought at the beginning gets reused later as an extension when you add a larger module.
How often do you need to refill the water reservoir?
It depends on the reservoir size, ambient temperature, and species kept, so there's no single figure that works for every case. As a general rule of thumb, it's best to check the level every few days rather than relying on a fixed schedule, and using an external Twist-type feeder makes refilling easier without opening the foraging area.
Does the same ant farm work for any species of ant?
The modular format works as a base for very different species, but the species you keep determines the type of ant farm needed: some need more humidity, others need a reinforced-access feeder for large mandibles, and others need almost no humid nest at all. It's worth researching the specific species' requirements before settling on the size and hydration system.