Will the Least Dwarf Crayfish eat my aquarium plants?

No, they are completely plant-safe. Their claws are too small and weak to damage healthy aquatic plants, though they will gladly scavenge on decaying leaves.

Can I keep them with dwarf shrimp like Cherry Shrimp?

Yes, with caution. While they are mostly peaceful, they are opportunistic scavengers. They usually ignore shrimp, but a slow or freshly moulted shrimplet might occasionally be caught.

Why is my crayfish lying on its side and looking pale?

This usually indicates that the crayfish is about to moult or is currently moulting. Do not disturb it during this highly vulnerable time, and ensure it has a quiet hiding spot.

Do I need to remove the white shell after they moult?

No, you should always leave the moulted exoskeleton in the aquarium. The crayfish will eat it over the next few days to reabsorb essential calcium and minerals needed for its new shell.

How many can I keep together?

In a 20-litre aquarium, you can comfortably keep a pair or trio, provided you have a complex layout with plenty of leaf litter, moss, and hiding tubes to break line of sight.

FreshwaterTropicalBeginner

Least Dwarf Crayfish

Cambarellus diminutus

The Least Dwarf Crayfish is a diminutive, peaceful invertebrate that adds fascinating scavenging activity to planted nano aquariums.

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Ideal Conditions

Temperature: 15 – 26 °C
pH range: 6.5 – 8
Hardness: 5 – 15 dGH
Adult size: 2 – 2.5 cm
20L for a pair: 20 litres+
Lifespan: 1.5 – 2 years
Diet: Omnivore
Water flow: gentle to moderate
Preferred setup: Sand or fine gravel substrate, heavily planted, with abundant hiding places using small rocks, driftwood, and leaf litter.

About the Least Dwarf Crayfish

The Least Dwarf Crayfish (Cambarellus diminutus) holds the unique distinction of being one of the smallest freshwater crayfish available in the aquarium hobby. Endemic to the south-eastern United States, this diminutive invertebrate rarely exceeds 2.5 cm in length, making it an exceptional candidate for nano aquariums. Unlike larger, more destructive crayfish species, it is completely plant-safe and highly engaging to watch as it actively patrols the substrate in search of food.

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Is it right for your tank?

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Where Least Dwarf Crayfish comes from

Native range

North America, Southeastern United States

Countries / regions

United States

Habitat

Slow-moving streams, shallow ponds, and swampy margins with dense vegetation and thick leaf litter.

Endemic to a very restricted range in southern Alabama and south-eastern Mississippi.

Similar species

Mexican Dwarf Orange Crayfish
Cambarellus patzcuarensis
Brazos Dwarf Crayfish
Cambarellus texanus
Cajun Dwarf Crayfish
Cambarellus shufeldtii

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Chili Rasbora
Boraras brigittae
Tiny, peaceful top-to-midwater swimmers that will completely ignore the crayfish, staying well out of their reach.
Great
Ember Tetra
Hyphessobrycon amandae
Peaceful nano fish that occupy the middle of the water column and will not bother the bottom-dwelling crayfish.
Great
Cherry Shrimp
Neocaridina davidi
Generally coexist peacefully, but an opportunistic crayfish may occasionally catch a slow, sick, or newly moulted shrimplet.
Compatible with caution
Betta Fish
Betta splendens
Bettas may prey upon the dwarf crayfish, especially after a moult, while the crayfish might nip at a resting Betta's long fins.
Not recommended
Convict Cichlid
Amatitlania nigrofasciata
Aggressive, predatory fish that will view this diminutive invertebrate as a quick snack.
Not recommended

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