Rubber Ducky Isopods: Care, Breeding & Setup Guide
Rubber Ducky isopods (Cubaris sp.) are a sought-after display species with a dark shell and a bright duck-yellow face. They’re slower-breeding and a little more particular than common clean-up crew isopods, but with stable warmth, high humidity and plenty of leaf litter they make a rewarding, eye-catching colony.
This guide covers everything you need to keep Rubber Duckies thriving — enclosure setup, conditions, feeding and breeding.
What are Rubber Ducky isopods?
Rubber Ducky is a Cubaris species named for the resemblance of its bright yellow head and dark body to a classic rubber duck. Like most Cubaris, they’re a tropical, humidity-loving species that’s prized as a display animal rather than a workhorse clean-up crew. They’re peaceful, stay relatively small, and are happiest in a stable, well-decorated enclosure.
You can see our current stock on the Rubber Ducky isopods product page.
Enclosure setup
A small, well-sealed tub or terrarium works well — Cubaris prefer stable humidity over large open spaces. Provide:
- Deep substrate of coco fibre, leaf mould and a little decaying wood so they can burrow.
- Plenty of leaf litter (oak, beech or magnolia) as their main food and cover.
- Cork bark and hides to give them dark, secure retreats.
- A calcium source such as cuttlefish bone or limewood.
- A moisture gradient — keep one end damp and the other slightly drier, with good ventilation to prevent stagnation.
Temperature and humidity
Aim for around 22–25°C with high, stable humidity. Cubaris dislike sudden swings and drying out, so a deep substrate that holds moisture and a partly-covered enclosure help keep conditions even. A little airflow is still important to avoid mould and stale air.
Feeding
Leaf litter and rotting wood form the bulk of their diet. Supplement with occasional protein (fish flake, dried shrimp) and keep a calcium source available at all times. Feed lightly and remove anything that goes mouldy — overfeeding is a common cause of mite outbreaks.
Breeding Rubber Ducky isopods
Rubber Duckies breed more slowly than hardy clean-up crew species, so patience is key. Given stable warmth, high humidity and an undisturbed setup, an established group will gradually produce young (called mancae). Avoid disturbing the colony too often, keep conditions consistent, and let the population build over several months. A healthy, settled colony is the goal rather than rapid numbers.
For general isopod husbandry, our Isopod Care Guide covers housing, leaf litter and calcium in more detail.
Frequently Asked Questions
They’re best suited to keepers with a little experience. Rubber Duckies are more sensitive to humidity swings and breed more slowly than hardy clean-up crew species like Dwarf White or Powder Orange isopods, so they reward stable, consistent care.
Slowly compared with common isopods. With stable warmth and high humidity an established colony grows steadily over several months rather than weeks, so it’s best to start with a small group and let them settle.
They will process waste, but they’re really kept as a display species. For a working clean-up crew most keepers choose faster, hardier isopods and keep Rubber Duckies in a dedicated enclosure where their colour can be appreciated.
Browse our captive-bred Rubber Ducky isopods and the full isopods range at Bioactive Bugs UK.