Know your companions
Armadillidium gestroi
Armadillidium gestroi is a rounded rolling isopod with dark plates and conspicuous yellow spotting. It is a distinct species, not a yellow-spotted color morph of the common pillbug. Individuals and life stages vary in pattern and size.
This sheet belongs to the matching Isopod King listing. Check its selected count and current availability before ordering; the care guide does not change the product's options or shipping terms.
Build the stronghold
A refuge beneath the leaves
Use a broad, secure enclosure with about 5–8 cm of organic substrate and deep hardwood leaf cover. Supply several low bark shelters, including one over the moisture boundary, so the colony is not forced into a single crowded hide.
Choose clean, pesticide-free materials and substrate without fertilizer or other chemical additives. Do not rely on plain coco fiber as the whole food supply. Secure ventilation openings against escapes, place the enclosure away from direct sun, and prepare it before the animals arrive.
Give them a choice
Two paths through the habitat
Maintain one damp end and a clearly less-wet end. Check under the bark and into the substrate rather than judging by surface condensation. Ventilation should refresh the air without exhausting the damp refuge between checks.
Air humidity alone cannot tell you whether the substrate under a hide is suitable. Check the refuge gently, keep cover in place, and adjust watering to ventilation and room conditions. Small juveniles need nearby sheltered moisture too.
Stock the royal pantry
Provisions for a living colony
Keep decaying leaves and hardwood available and leave a suitable calcium source in place. Scale supplements to consumption, not to the impressive size of the adults; a small group can still leave an oversized serving to spoil.
A suitable calcium source, such as cuttlebone, should remain accessible. Fresh and protein foods supplement the habitat's decaying plant material. Remove spoiled leftovers, reduce the next portion when food persists, and keep an eye on leaf cover as the colony grows.
Steady care, patient growth
Take up the colony watch
On arrival
Have the enclosure ready before opening the shipping container. Follow our arrival and acclimation guide, and give the colony a quiet place to settle.
During maintenance
Check moisture, leaf cover, leftovers and airflow. Observe a familiar shelter without overturning every hide. Track leaf consumption and the condition of the damp refuge; judge colony progress over time without promising a breeding deadline.
Give pale or molting animals space and avoid peeling away old shell. Females carry developing young in a brood pouch; growth varies with age, conditions and the starting group. Do not expect a fixed breeding timetable. Never release captive isopods outdoors.
A role in the living habitat
Every companion has a place
Gestroi can contribute to decomposition where enclosure conditions suit it. A display colony is also a good way to observe its spotted pattern. Predators, constant disturbance, or a uniformly wet terrarium can undermine an otherwise suitable setup.
Continue removing excessive waste and checking the needs of every inhabitant. A cleanup crew supports routine care; it does not replace it.
Observe before you adjust
Read the signs along the trail
| What you notice | First checks |
|---|---|
| Refuge drying out | Inspect beneath the moss; restore moisture gradually without flooding. |
| Mold on fresh food | Remove leftovers and review portion size, water and airflow. |
| An overheated enclosure | Check sunlight and nearby heaters; protect the culture from heat. |
| Repeated losses | Record conditions and recent changes. Send clear photos to our keeper team. |
These are habitat checks, not diagnoses. If problems continue, ask Isopod King for help before making several large changes at once.
From the keeper’s camp
Questions along the journey
Should I keep Gestroi warmer to make it grow faster?
Do not chase faster growth with extra heat. Stable moderate room conditions, food, calcium and reliable moisture are a better starting point than pushing toward the warm end of a range.
How often should I water?
Use the condition of the damp refuge as your guide. Ventilation, substrate depth and room conditions change how quickly it dries, so check it and water selectively instead of following one fixed schedule.
Where can I continue learning?
Explore moisture gradients, feeding essentials and your first 30 days in the Care Archives.
Find your colony
Begin your Gestroi colony story
Gestroi Isopods
Armadillidium gestroi
See the product page for current counts, prices, stock and shipping options.
The keeper’s journal
Your colony’s ongoing story
Track leaf consumption and the condition of the damp refuge; judge colony progress over time without promising a breeding deadline. A few short notes on watering, feeding, molts and enclosure changes help reveal patterns without constant disturbance.
- Keep a usable damp refuge.
- Replenish leaves, suitable wood and calcium.
- Remove spoiled supplements.
- Record changes and ask for help when needed.
Care guide reviewed October 25, 2026. Speak with the Isopod King keeper team →