When should I move my ants out of the test tube?

Not before the colony has roughly 20 to 50 workers, or the tube becomes genuinely uninhabitable through mould or a dried reservoir. Small colonies in big nests do worse, not better.

How do I get ants to move to a new nest?

Connect the new nest to their current home with tubing and make the new nest more attractive — darker, slightly warmer, correctly humid — while leaving the old home exposed to light. Then wait; days to weeks is normal.

Can I just tip my ants into the new nest?

Avoid it. Forced moves stress the colony, risk injuring the queen, and the ants often march straight back. A colony that walks itself in settles far faster.

Why won't my ants move into the new nest?

Usually because the old home is still comfortable, or the new nest is too dry, too bright, too large, or smells unfamiliar. Make the old home less attractive and give it time.

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CareNo. 14 · 7 min

Moving Your Colony Into Its First Formicarium

When a colony is ready to leave the test tube, and how to move it without stress — connection methods, light and heat tricks, and what not to do.

A healthy founding colony eventually outgrows its test tube — but the move to a first proper nest is a step many keepers rush. Move too early and the colony struggles; force the move and you stress the queen. Done right, the ants move themselves, and your job is just to make the new home the obviously better option.

When to move

Wait for either of these:

The colony has around 20–50 workers and brood, and the tube is visibly crowded, or
The tube has become uninhabitable — the water reservoir has dried out, or mould has taken hold.

If neither is true, don’t move. A dozen ants in a nest built for hundreds can’t control humidity, feel exposed, and often haul their brood into one corner and sulk. This is one of the classic beginner mistakes. If in doubt, a second connected test tube buys months.

Choosing the nest itself — material, size, style — is covered in choosing a formicarium. The short version: buy the smallest nest that fits the colony you have, not the colony you’re imagining.

The self-move method

Ants constantly evaluate nest sites. Give them a better option and they’ll move house on their own, brood and all — often overnight.

Connect the new formicarium to the current setup with flexible tubing. Most nests and tube-adapters share standard sizes; check before buying.
Hydrate the new nest to the right level for your species first — a dry nest will be rejected outright.
Make the new nest attractive: keep it dark (red film or a cover) and, if you use heating, place gentle warmth on the new nest so it wins the comparison. The heating and humidity guide covers safe setups.
Make the old home unattractive: unwrap the test tube and expose it to normal room light.
Wait. Scouts explore first, then suddenly the whole colony porters the brood across. Days is typical; a stubborn colony can take a few weeks.

What not to do

Don’t tip them in. You’ll scatter brood, panic the colony, and possibly injure the queen.
Don’t repeatedly disturb the setup mid-move — every disturbance resets their confidence.
Don’t disconnect the old tube the moment you see ants in the new nest. Let them abandon it fully; some colonies keep the old tube as a rubbish dump for a while, which is fine.
Don’t chill the old home to force a move — temperature-shocking a colony with brood does more harm than a slow move ever will.

After the move

Give the colony a quiet week to settle before any major cleaning. Remove the old tube once it’s genuinely empty, keep the outworld stocked as usual with food, and resist redecorating the nest — familiarity is comfort. From here, colony growth accelerates: enjoy it.

Common questions

When should I move my ants out of the test tube?: Not before the colony has roughly 20 to 50 workers, or the tube becomes genuinely uninhabitable through mould or a dried reservoir. Small colonies in big nests do worse, not better.
How do I get ants to move to a new nest?: Connect the new nest to their current home with tubing and make the new nest more attractive — darker, slightly warmer, correctly humid — while leaving the old home exposed to light. Then wait; days to weeks is normal.
Can I just tip my ants into the new nest?: Avoid it. Forced moves stress the colony, risk injuring the queen, and the ants often march straight back. A colony that walks itself in settles far faster.
Why won't my ants move into the new nest?: Usually because the old home is still comfortable, or the new nest is too dry, too bright, too large, or smells unfamiliar. Make the old home less attractive and give it time.

Last updated 5 August 2026