Platinum Isopods (Cubaris sp.)

Cubaris sp. 'Platinum' is one of the most genuinely dazzling and exclusive isopods in the UK hobby — an ultra-rare Thai species prized for its remarkable metallic, silvery sheen unlike anything else in the genus. Ranging from a pale silver to a bright, almost lustrous platinum hue, their exoskeleton catches the light in a way no other isopod quite matches, giving a colony a genuinely jewel-like quality. Sometimes traded as the "Platinum-Metallica Ducky," they pair that striking metallic colouration with the appealing domed Cubaris body and classic charm of the genus. For serious collectors seeking a true showpiece, the Platinum is about as exclusive as Cubaris get.

What makes the Platinum particularly worth keeping is the combination of that unique metallic beauty with the rewarding challenge of a premium Cubaris. They're rated Medium difficulty and genuinely ultra-rare — a slow-breeding, sought-after collector's piece — best suited to keepers with some Cubaris experience who can provide the stable, humid, warm conditions the genus needs. They're not the most demanding Thai cave species, but they do reward consistency and care. They sit at the very top of the premium Cubaris category alongside the iconic Rubber Ducky, the elegant Black Pearl, and the pale Snow Queen.

Like other Cubaris, Platinums originate from humid, limestone-rich environments in Thailand, which directly informs their care — stable high humidity, a calcium-rich substrate, and consistent warmth. They share the classic Cubaris temperament: shy, nocturnal, and inclined to hide rather than wander in the open, with their domed body offering protection when threatened. Like all Cubaris, they conglobate (roll into a tight defensive ball) when disturbed — and a metallic silver sphere is a particularly striking sight.

Quick Care Summary

• Scientific Name: Cubaris sp. 'Platinum'
• Common Names: Platinum Isopod, Platinum-Metallica Ducky, Cubaris Platinum
• Family: Armadillidae
• Genus: Cubaris
• Origin: Thailand — humid, limestone-rich environments
• Adult Size: 10–15 mm (1–1.5 cm) — medium-sized Cubaris
• Lifespan: 2–3 years typical
• Difficulty: Medium — some Cubaris experience beneficial
• Temperature: 23–26°C (warm-tropical preference)
• Humidity: High (70–85%) with a moisture gradient
• Ventilation: Low to medium — balance airflow with humidity retention
• Conglobation: Yes — rolls into a tight defensive ball
• Behaviour: Shy, nocturnal, reclusive, prefers hiding in substrate and cover
• Breeding: Slow — builds gradually; patience rewarded

What Makes Platinum Isopods Special

Several factors have made the Platinum one of the most coveted premium Cubaris in the UK hobby:

The metallic, silvery sheen is genuinely unique. Ranging from pale silver to a bright platinum hue, their lustrous metallic exoskeleton is unlike any other isopod — a genuinely jewel-like quality that catches the light beautifully. Against a naturalistic dark substrate, the effect is striking and sophisticated, and it's the single biggest reason collectors chase them.

Genuine ultra-rarity. Rated ultra rare, the Platinum is a true exclusive — seldom available and highly sought-after. For serious Cubaris collectors, an established Platinum colony is a genuine prize and a showpiece addition.

The appealing domed Cubaris form. They have the classic rounded, domed Cubaris body that gives them their charm and offers protection when they roll up. Combined with the metallic colouration, they're a genuinely beautiful, characterful isopod.

Premium without extreme difficulty. The Platinum gives you an ultra-rare, visually spectacular Cubaris without the most exacting care of the very hardest Thai cave species. For keepers ready to move beyond the easiest Cubaris but not wanting the most challenging, it's a well-judged premium option — provided you can maintain the stable, humid conditions it needs.

Striking display centrepiece. The metallic silver against a planted, naturalistic enclosure makes for a genuinely beautiful display — the kind of high-contrast, jewel-like elegance that photographs well and draws the eye as a true centrepiece.

Conglobation. Like all Cubaris, they roll into a tight defensive ball when disturbed — and a gleaming metallic sphere is a particularly elegant sight compared to drab or mottled species.

How Platinum Compares to Other Cubaris

If you're choosing between premium Cubaris, here's how the Platinum fits in:

• vs Rubber Ducky: Rubber Duckies are the iconic premium Cubaris with their famous duck-face markings; Platinums offer the unique metallic silver sheen instead. Both premium display Cubaris — choose Rubber Ducky for the famous markings, Platinum for ultra-rare metallic elegance.
• vs Black Pearl: A striking tonal opposite — Black Pearls are deep glossy black, Platinums gleaming silver. Both solid-colour premium Cubaris with similar care — they'd make a spectacular light-and-dark pair in a collection.
• vs Snow Queen: Snow Queens are soft snow-white; Platinums are metallic silver. Both pale, elegant premium Cubaris — the Platinum with its distinctive lustrous metallic quality versus the Snow Queen's matt white.
• vs Cappuccino: Cappuccinos show marbled coffee-and-cream tones; Platinums are gleaming metallic silver. Both premium Cubaris with similar care — very different colour expressions for collectors.
• vs Amber Firefly: Amber Fireflies glow warm amber-orange; Platinums shine cool metallic silver. Opposite ends of the colour spectrum within premium Cubaris — warm glow versus cool metallic.

Browse the full Cubaris collection to compare all options in this premium genus.

Physical Traits and Characteristics

• Adults reach approximately 10–15 mm — a medium-sized Cubaris
• Metallic exoskeleton ranging from pale silver to bright platinum
• Rounded, domed body shape (offers protection and gives them their charm)
• Can conglobate (roll into a tight ball) when disturbed or threatened
• Lustrous sheen that catches the light, most striking against dark substrate
• Colouration may appear slightly different immediately after moulting, settling as the new exoskeleton hardens

Setting Up the Enclosure

A 6–10 litre container with a secure lid suits a starter colony. Ventilation should be low to medium — enough to prevent stagnation, but not so much that it dries out the high humidity these isopods need. The 3L Braplast tub works for starter colonies, with larger housing as the colony grows; our Braplast vent plugs help maintain humidity while preventing tiny mancae from escaping.

Keep the enclosure in a dim, quiet area reflecting their cave origins, and away from windows, radiators, or other sources of temperature fluctuation. Provide plenty of hiding spots with cork bark, leaf litter, and moss so the isopods feel secure. The metallic sheen shows beautifully against dark substrate under gentle indirect lighting. Browse our accessories collection for appropriate enclosures, vents, and other essentials.

Substrate

Use a substrate mix that retains moisture and provides calcium — genuinely important for Cubaris:

• Organic topsoil (pesticide-free) as the base
• Sphagnum peat moss for moisture retention
• Flake soil for added nutrition and structure
• Crushed limestone worked throughout for calcium
• Decomposed leaf litter mixed into the substrate
• Pieces of white-rotted hardwood

We recommend a topsoil, sphagnum, and limestone-based mix rather than relying on coco coir, which lacks the calcium Cubaris require and doesn't replicate their limestone-rich natural environment. Avoid any chemically-treated substrates or additives. Substrate depth: at least 5–8 cm to allow for burrowing behaviour.

Top layer: Generous hardwood leaf litter — magnolia leaves work particularly well for long-lasting cover. Add cork bark (flat pieces and tubes), hardwood pieces, and sphagnum moss clumps on the humid side. Plenty of cover and varied microhabitats encourage natural behaviour and help the colony feel secure.

Humidity and Temperature

Maintain high humidity (70–85%) with a moisture gradient. Keep one side of the enclosure more humid than the other — add damp sphagnum moss to the humid side and mist this area regularly, while the drier side still has leaf litter coverage but won't need regular misting. This gradient lets the isopods regulate their own moisture needs. The substrate should be damp in the moist zone but never waterlogged, and the enclosure well-sealed enough to hold humidity while still allowing some airflow.

Don't overwater. As one PostPods customer noted about Cubaris-type isopods, following proper care guidance prevents the most common fatal mistake — too much moisture. While Platinums need consistent high humidity, waterlogged substrate causes problems. Maintain damp-but-not-wet conditions and mist to top up humidity rather than saturating the substrate. Adequate ventilation alongside the humidity also helps prevent mould.

Temperature should be 23–26°C — these are warm-tropical Cubaris that need consistent warmth and stability. Avoid temperature fluctuations, and don't place the enclosure near heat sources or windows. If your home regularly drops too low, a heat mat on a thermostat helps — position it on one side of the enclosure to maintain the gradient, never underneath (which dries the substrate).

Diet

Platinums are detritivores and will work through the usual range of organic matter:

• Staples (always available): Dried leaf litter (oak, beech), decaying white-rotted hardwood, and the substrate itself when properly prepared with organic matter
• Vegetables (supplementary): Carrot, courgette, sweet potato. Dried vegetables are useful and less prone to mould. Replace fresh produce within 24–48 hours.
• Fruit (occasionally): Small amounts of soft, sweet fruit — remove uneaten portions promptly
• Protein (1–2x weekly): Fish flakes, dried shrimp, freeze-dried insects. Browse our accessories collection for the full range of protein supplements.
• Calcium (essential — always available): Crushed limestone, cuttlefish bone, powdered eggshells, oyster shell. Their limestone cave origins mean they evolved with ready access to calcium, and deficiency leads to moulting problems. Provide a constant source.

Feed sparingly with fresh foods. These isopods graze continuously on leaf litter and substrate, so vegetables and commercial foods are supplements rather than the bulk of their diet. Overfeeding fresh foods encourages mould, which thrives in the same humid conditions your isopods need. A thriving springtail culture helps manage any mould.

Breeding

Platinums are slow breeders — part of why they're so rare and exclusive. Reproduction is gradual, and a colony builds over time rather than booming. Patience and consistent husbandry are genuinely rewarded.

Breeding basics:

• Females brood eggs in a marsupium and release fully-formed juveniles
• Broods are typically small and reproduction is slow
• Stable conditions are important — temperature or humidity fluctuations can disrupt breeding
• A starting group gives better odds of establishing a breeding population
• Juveniles develop the metallic platinum colouration as they mature

For breeding success:

• Maintain humidity consistently in the 70–85% range
• Keep temperature stable within the 23–26°C range
• Provide plenty of calcium for breeding females
• Include varied microhabitats (bark, wood, moss, leaf litter)
• Minimise disturbance during establishment — resist digging through the substrate to check on them

Don't expect rapid population growth — the Platinum's slow breeding is exactly why it remains such a prized rarity. With patience and stable conditions, numbers build steadily over time.

Pair With Springtails

Add a thriving springtail culture to any Platinum setup. Springtails handle mould and microbial growth at a scale isopods can't manage — particularly important in the humid conditions these tropical Cubaris require, and especially valuable for protecting an ultra-rare, premium colony from mould blooms around protein foods. They coexist peacefully with Platinums and form an essential cleanup partnership.

Who Should Buy Platinum Isopods?

Ideal for:

• Serious Cubaris collectors seeking an ultra-rare, metallic showpiece
• Keepers with some experience maintaining humid enclosures
• Those patient with slow-breeding premium species
• Keepers who appreciate observing rather than handling their isopods
• Display enthusiasts who love the jewel-like metallic sheen against dark substrate
• Anyone building a high-end premium Cubaris collection

Not ideal for:

• Complete beginners — start with hardier species like Dairy Cow or accessible Cubaris like Cubaris murina first
• Low-humidity or excessively-ventilated setups (they need consistent moisture)
• Setups prone to temperature or humidity fluctuation (they need stability)
• Those wanting constantly visible, wandering isopods (Platinums are shy and reclusive)
• Keepers wanting fast, prolific colony growth
• Using a rare, premium species as disposable bioactive cleanup crew

Realistic Expectations

They're shy and reclusive. Platinums spend most of their time hidden beneath bark, leaf litter, or within the substrate, becoming more active after dark. This is typical Cubaris behaviour, not a sign of poor health. They're a species to observe and maintain rather than handle — if you want constantly-visible isopods, hardier species may suit better.

They need stable conditions. The Platinum is less forgiving than hardy species when humidity or temperature fluctuates. Consistency genuinely matters — stable, warm, humid conditions are the key to keeping and breeding them successfully, and they do best left largely undisturbed once established.

Breeding is slow. This is exactly why they're so rare and exclusive. Don't expect population explosions — patience and consistency are rewarded with gradual, steady growth over time.

The metallic sheen develops and catches the light. The lustrous platinum quality is at its best on mature, settled individuals against dark substrate under gentle lighting; colouration may look slightly different right after moulting before the new exoskeleton hardens.

Don't overwater them. While they need consistent high humidity, excess moisture is the most common cause of Cubaris problems. Maintain a proper gradient with damp-but-not-waterlogged substrate, and adequate ventilation to prevent mould — this is the key husbandry point.

Building Your Setup

A complete Platinum setup needs a humidity-retentive, calcium-rich substrate, abundant calcium sources, generous leaf litter, plenty of cork bark hides, and protein supplements. Browse our accessories collection for everything you need — enclosures, ventilation, leaf litter, calcium (cuttlebone, limestone, oyster shell), and protein supplements (fish flakes, dried shrimp).

Browse the full Cubaris collection for more premium species, or read our blog post on Cubaris isopods you should know about for detailed guidance on this popular genus.