Know your companions
Cubaris sp.
Rubber Ducky is a trade name for an undescribed Cubaris species. Its rounded body, yellow face and darker middle plates make it a distinctive display animal. Keep its culture label with the colony; a trade name does not establish a formal species identification.
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
Give these shy companions a deep, food-rich substrate with decayed hardwood and leaf litter. Start with roughly 8 cm of usable bedding where enclosure depth permits, and add cork shelters over a reliably damp area. Leave covered room to move toward a less wet zone.
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
Keep the refuge consistently hydrated and ventilate the enclosure without letting the bedding dry through. Water the damp side selectively; a sealed, saturated tub is not a substitute for a stable humid refuge. Check beneath cover rather than repeatedly lifting the animals.
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 soft decaying leaves and suitable rotten hardwood available continuously. Offer tiny supplemental portions near shelter and watch what disappears. Slow, shy feeding does not justify piling up fresh food, and moldy leftovers should be removed.
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. Record whether the refuge remains moist between checks and whether food is actually being used.
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
Best kept as a dedicated display colony. A small, slow-establishing Rubber Ducky group is not a dependable first choice for processing heavy waste in a mixed vivarium.
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
Why do my Rubber Duckies stay hidden?
Sheltering is normal for a secretive colony. Check habitat conditions gently and allow time to settle. Avoid digging through the substrate to count them, which disturbs both adults and developing young.
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 Rubber Ducky colony story
Rubber Ducky Isopods
Cubaris sp.
See the product page for current counts, prices, stock and shipping options.
The keeper’s journal
Your colony’s ongoing story
Record whether the refuge remains moist between checks and whether food is actually being used. 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 →