An expert-level, tiny freshwater shrimp endemic to Lake Towuti in Sulawesi. Known for its striking red and white bands and shy nature. In the wild, they live symbiotically with a specific freshwater sponge, though in aquariums they can be sustained on mature biofilm. They require extremely stable, warm, alkaline water parameters and should only be kept by advanced aquarists.
Freshwater Harlequin Shrimp (Sulawesi) At a Glance
Freshwater Harlequin Shrimp (Sulawesi) Tank Requirements
Will Freshwater Harlequin Shrimp (Sulawesi) fit in your tank?
Care guides tell you what Freshwater Harlequin Shrimp (Sulawesi) needs, the next question is whether your tank can safely provide it. Test Freshwater Harlequin Shrimp (Sulawesi) against your tank size, maintenance needs, and the fish you already keep before you buy.
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Freshwater Harlequin Shrimp (Sulawesi) Water Parameters
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Freshwater Harlequin Shrimp (Sulawesi) Temperament & Compatibility
Freshwater Harlequin Shrimp (Sulawesi) Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Standard
The standard form. Due to their extreme sensitivity, they must be kept in biologically mature tanks (ideally 10+ gallons to prevent temperature and pH swings) with warm, alkaline water that mimics Lake Towuti. They graze continuously on biofilm and are best kept in a species-only setup.
Differs in 1 trait from base species
Also known as: Harlequin Sulawesi Shrimp
Freshwater Harlequin Shrimp (Sulawesi) Care Guide Summary
The Freshwater Harlequin Shrimp (Sulawesi), scientifically known as Caridina cf. spongicola, belongs to the Invertebrates family group. Adults reach a maximum size of approximately 1.5 cm and have a compressed body shape with a slow growth rate. Classified as peaceful, this species primarily occupies the bottom zone of the aquarium and produces a low level of biological waste.
To thrive, the Freshwater Harlequin Shrimp (Sulawesi) requires a freshwater only aquarium with a minimum volume of 38 litres and a tank length of at least 45 cm. Water temperature should be maintained between 26°C and 30°C, with a pH range of 7.5–8.5 and a general hardness of 4–8 dGH. A low water flow is preferred.
The Freshwater Harlequin Shrimp (Sulawesi) is a rewarding species to keep, provided its core environmental needs are met. The Freshwater Harlequin Shrimp (Sulawesi) is typically available in one standard form.
Freshwater Harlequin Shrimp (Sulawesi) Habitat Setup
When setting up an aquarium for the Freshwater Harlequin Shrimp (Sulawesi), a low water flow best suits their natural preferences. Because this species occupies the bottom zone, the aquarium layout should prioritise sufficient floor space with hiding spots among rocks, wood, or dense planting. Useful additions include smooth gravel or rounded substrate to protect their sensitive barbels and an established tank with natural algae growth, as they depend on it as a primary food source.
Freshwater Harlequin Shrimp (Sulawesi) Compatibility Notes
Classified as peaceful, the Freshwater Harlequin Shrimp (Sulawesi) is a schooling species that feels most secure in a sizeable group, where natural shoaling behaviour reduces stress and brings out their best colours. When choosing tankmates, boisterous or fast-moving tankmates may cause this species undue stress. Selecting tankmates that favour different water layers from the bottom zone can help reduce competition and territorial overlap.
Freshwater Harlequin Shrimp (Sulawesi) Recommended Tank Sizes
Standard aquarium sizes that meet the minimum volume and length requirements for Freshwater Harlequin Shrimp (Sulawesi).
10 Gallon Standard
15 Gallon Standard
20 Gallon High
20 Gallon Long
29 Gallon Standard
30 Gallon Breeder
Show 22 more tank sizes
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Frequently Asked Questions About Freshwater Harlequin Shrimp (Sulawesi)
How big does Freshwater Harlequin Shrimp (Sulawesi) get?
Freshwater Harlequin Shrimp (Sulawesi) (Caridina cf. spongicola) typically reaches a maximum adult size of approximately 1.5 cm. They have a compressed body shape and a slow growth rate.
What tank size does Freshwater Harlequin Shrimp (Sulawesi) need?
A minimum aquarium volume of 38 litres and a tank length of at least 45 cm are recommended for Freshwater Harlequin Shrimp (Sulawesi). This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Freshwater Harlequin Shrimp (Sulawesi) need?
Freshwater Harlequin Shrimp (Sulawesi) thrives in freshwater only conditions with a temperature range of 26–30°C, a pH between 7.5 and 8.5, and a general hardness of 4–8 dGH. A low water flow is preferred.
Is Freshwater Harlequin Shrimp (Sulawesi) peaceful or aggressive?
Freshwater Harlequin Shrimp (Sulawesi) is classified as peaceful with an aggression score of 0 out of 10. They are generally well-suited to peaceful community tanks.
How many Freshwater Harlequin Shrimp (Sulawesi) should be kept together?
Freshwater Harlequin Shrimp (Sulawesi) is a schooling species and should be kept in groups of at least 6. Larger groups help distribute aggression and encourage natural schooling behaviour.
Does Freshwater Harlequin Shrimp (Sulawesi) have any special tank requirements?
Yes. Freshwater Harlequin Shrimp (Sulawesi) benefits from established algae (otocinclus) and smooth gravel (sensitive barbels) in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Top Tank Mates for Freshwater Harlequin Shrimp (Sulawesi)
These fish are strong compatibility matches for Freshwater Harlequin Shrimp (Sulawesi) based on water preferences, temperament, adult size, and tank behavior.
Plants That Suit Freshwater Harlequin Shrimp (Sulawesi)
These plants pair well with Freshwater Harlequin Shrimp (Sulawesi) based on shared water preferences, layout fit, and how likely they are to hold up in the same aquarium.
Amazon Frogbit
Limnobium laevigatum
Asian Watergrass
Hygroryza aristata
Asian Watermoss
Salvinia cucullata
Banana Plant
Nymphoides aquatica
Beckett's Water Trumpet
Cryptocoryne beckettii
Broad-leaved Crypt
Cryptocoryne pontederiifolia
Fish Similar to Freshwater Harlequin Shrimp (Sulawesi)
Cardinal Shrimp (Sulawesi)
Caridina dennerli
A stunning but highly sensitive dwarf shrimp native to the ancient Lake Matano in Sulawesi, Indonesia. Famous for its bright red coloration and contrasting white front appendages (often called 'white gloves'). They require extremely specific, pristine water conditions (high temperature, high pH, specific remineralizers) and are only recommended for advanced aquarists.
Orange Delight Shrimp
Caridina loehae
An advanced-level, delicate dwarf shrimp native to the ancient Malili lake system in Sulawesi, Indonesia. Scientifically described as Caridina loehae, they are characterized by their bright orange bodies and white dashes. They require highly stable, warm (26-29°C), and alkaline water mirroring their native ancient lakes. They are peaceful biofilm grazers that will not survive in standard freshwater conditions.
Bee Shrimp
Caridina logemanni
A highly prized dwarf freshwater shrimp known for its striking opaque color bands. Native to streams in Southern China, they require specific parameters to thrive: cool, highly oxygenated, acidic, and very soft water. This is usually achieved using RO (Reverse Osmosis) water remineralized with specific shrimp salts and active buffering soil. They are highly sensitive to nitrogen spikes and copper, and are extremely vulnerable to fish predation.
Amano Shrimp
Caridina multidentata
A highly popular, industrious freshwater shrimp renowned for its unmatched algae-eating abilities. Popularized by aquascaper Takashi Amano, they are significantly larger and hardier than most dwarf shrimp (like Cherry Shrimp). They are notorious food-thieves during feeding time and excellent escape artists, requiring a tight-fitting lid. Their larvae require saltwater to develop, so they will not overpopulate in a freshwater aquarium.
Otocinclus
Otocinclus vittatus
A small, peaceful, and highly popular algae-eating catfish native to South America. They are obligate shoaling fish that thrive in mature, heavily planted aquariums with steady water parameters and a constant supply of soft green algae and biofilm. They are extremely sensitive to uncycled or pristine/new tanks without natural food sources.
Panther Crab
Parathelphusa pantherina
A striking, fully aquatic freshwater crab endemic to Lake Matano in Sulawesi, Indonesia. Recognizable by its pale yellow-orange body covered in dark panther-like spots. They are opportunistic scavengers and predators that will hunt snails, shrimp, and bottom-dwelling or sleeping fish. They are notorious escape artists and require a very tight-fitting lid. Unlike many crabs, they do not require a land area, though they need plenty of underwater rock caves.