Caridina ensifera 1 - 1, (Caridina ensifera) — 1-1,5cm

Overview

The aquarium shrimp Caridina ensifera is a rare, tiny Sulawesi species from Lake Poso that thrives in stable, pristine aquariums with abundant biofilm and peaceful tankmates. Endemic to Lake Poso in Sulawesi, Indonesia, this diminutive shrimp displays subtle beauty, specialized habitat requirements, and challenging care needs that make it a prized addition for dedicated shrimp enthusiasts. Available for sale UK aquarists should note that this species requires expert-level care with specific water parameters and pristine conditions. At 1-1.5cm, these specimens are juveniles or young adults that will reach full adult size of approximately 1.5cm, remaining perfectly sized for nano and specialist shrimp aquariums.

Appearance and Colouration

Caridina ensifera displays subtle colouration ranging from translucent cream to pale grey or greenish tones, often with faint banding or speckling visible under good lighting. The body is slender and delicate, with long antennae and a distinctive elongated rostrum that gives the species its scientific name. At 1-1.5cm, these tiny shrimp are already recognisable but will develop slightly more intense colouration as they mature. The overall appearance is understated compared to more colourful Caridina species, but the delicate beauty and rarity make this species highly sought after by specialist shrimp keepers. Healthy specimens display active movement and clear, unblemished exoskeletons.

Natural Habitat

Endemic to Lake Poso in Sulawesi, Indonesia, Caridina ensifera inhabits a variety of substrates including wood, rocks, sand, and aquatic macrophytes, and is also found in pelagic swarms. The lake features unique water chemistry with elevated pH, moderate hardness, and stable tropical temperatures. Water is crystal-clear with excellent oxygenation and abundant biofilm and micro-organisms. This species is suspected to inhabit primarily shallow water zones where biofilm and grazing opportunities are plentiful. Recreating these pristine, stable conditions with appropriate water chemistry and abundant biofilm is essential for long-term success with this challenging species.

Aquarium Setup

Provide a minimum of 30 litres with a mature, well-established filtration system that maintains pristine water quality without removing all biofilm. Use a fine substrate such as sand or small smooth gravel. Furnish the aquarium heavily with driftwood, smooth rocks, live plants such as Java moss, Java fern, and Anubias, and leaf litter to create abundant grazing surfaces and hiding places. Maintain gentle filtration with excellent oxygenation. Use elevated pH and moderate hardness to replicate Lake Poso conditions. Perform small, regular partial water changes to maintain stability. Avoid rapid parameter fluctuations, as Sulawesi shrimp are highly sensitive. Provide moderate lighting to support biofilm growth.

Diet and Feeding

Caridina ensifera is an omnivorous micrograzer that feeds primarily on biofilm, algae, and micro-organisms. In aquaria, supplement with high-quality shrimp foods such as specialized shrimp pellets, blanched vegetables such as spinach or kale offered in very small amounts, and occasional protein-rich foods in minute portions. Feeding is passive and continuous; the shrimp graze biofilm constantly when conditions are suitable. Success depends on maintaining a steady supply of natural biofilm and micro-organisms in the aquarium. Avoid overfeeding prepared foods, as excess nutrients can degrade water quality and harm this sensitive species.

Behaviour and Temperament

Caridina ensifera are entirely peaceful and constantly active, grazing on surfaces throughout the aquarium. They are most confident in groups and display natural schooling behaviour, often clustering on favoured grazing spots or plants. These shrimp are active during the day and night, making them enjoyable to observe despite their small size. During moulting, they will seek shelter until the new exoskeleton hardens. Females carry eggs under the abdomen for several weeks, fanning them regularly until shrimplets hatch. Well-maintained colonies breed readily in suitable conditions, though success depends on pristine water quality and abundant food sources.

Suitable Tank Mates

Best kept with other peaceful shrimp or in a species-only aquarium. Snails make suitable tankmates and pose no threat. Avoid large fish, aggressive fish, predatory fish, crayfish, and any fish large enough to eat shrimp. Even small, supposedly peaceful fish such as micro rasboras may pose a risk to shrimplets. For best breeding success and minimal stress, a dedicated shrimp-only aquarium with abundant biofilm and stable parameters is strongly recommended. If housing with fish, choose only the smallest, gentlest nano species and monitor closely.

Breeding

Breeding is possible in captivity but requires stable, clean water and excellent food availability. Like most Caridina, females carry eggs under the abdomen until hatching, and juveniles are miniature versions of adults that do not require a larval brackish stage. Shrimplets need mature biofilm-rich aquariums with abundant natural grazing surfaces and hiding places. Provide excellent water quality, stable parameters, and adequate calcium for egg and exoskeleton development. In a well-maintained, mature aquarium with stable Lake Poso-like conditions, breeding success is achievable. Remove predatory tankmates if breeding is desired. Colonies can grow steadily under optimal conditions.

Special Considerations

Best kept in a mature, stable aquarium with excellent filtration and no copper-based medications. Provide plenty of surface area for grazing, hiding places, and avoid sudden changes in temperature, pH, or hardness. Caridina ensifera are highly sensitive to water parameter fluctuations and poor water quality. Maintain elevated pH (7.5-8.5) and moderate hardness to replicate Lake Poso conditions. After moulting, leave the shed exoskeleton in the tank for the shrimp to consume as a calcium source. This species is best suited to experienced shrimp keepers with dedicated Sulawesi biotope aquariums and the ability to provide exacting, stable care.

Why Buy from Tropical Fish Co

Tropical Fish Co is a trusted UK supplier of rare, healthy Sulawesi shrimp including Caridina ensifera. Each specimen is carefully selected for active behaviour, robust health, and excellent condition. Our livestock is quarantined and health-checked before dispatch, ensuring you receive only the finest quality. We provide expert care advice, detailed species information, and ongoing support to help you succeed with specialist shrimp. With fast, secure delivery across the UK and a commitment to sustainable, responsible fishkeeping practices, Tropical Fish Co is your reliable partner for premium freshwater invertebrates and rare aquatic livestock.