Red Crystal Shrimp Care Guide - Setup, Feeding & Breeding

Red Crystal Shrimp are small freshwater ornamental shrimp recognised for their striking bands or patches of opaque white and vivid red across the body. Their colour pattern can vary considerably, from mostly white individuals with red markings to shrimp carrying broad, richly coloured red sections. They are graded by pattern quality and contrast in the aquarium hobby.

These peaceful invertebrates spend much of their time walking over surfaces, picking at biofilm and using their delicate appendages to investigate food and debris. They are most active in a settled group, particularly when grazing on plants, wood, rocks and other textured surfaces.

In nature, Caridina cantonensis is associated with clear, cool, mineral-rich streams and shaded waterways. The species is adapted to rocky habitats with gentle to moderate flow, where fallen leaves, algae and microorganisms provide shelter and food.

Red Crystal Shrimp are selectively bred from bee shrimp lines and are generally more sensitive than many commonly kept freshwater shrimp. Their popularity comes from the contrast of their colouration, their interesting social behaviour and their ability to reproduce entirely within freshwater.

Red Crystal Shrimp are selectively bred colour forms of Caridina cantonensis, a freshwater shrimp native to southern China, Hong Kong and adjacent parts of southeastern Asia. The red-and-white pattern was developed through aquarium breeding rather than occurring as a single natural wild form.

A group of Red Crystal Shrimp can be kept in an established aquarium of at least 20 litres, with a footprint of approximately 30 by 25 cm or larger; a bigger tank offers greater stability. Use a gentle filter with an intake guard or sponge pre-filter, modest water movement and reliable biological filtration. Fine inert or shrimp-specific substrate, mosses, live plants, leaf litter, branching wood and porous rock provide grazing surfaces and shelter. Avoid copper-based treatments, sudden changes in water chemistry and recently set-up tanks lacking mature biofilm.

Females reach about 2.5 cm (1 inch), while males usually grow to around 2 cm (0.8 inches).

Red Crystal Shrimp graze naturally on biofilm, algae and microorganisms growing on aquarium surfaces. Supplement this with a high-quality shrimp food containing suitable minerals and plant matter, along with occasional blanched spinach, courgette, nettle leaves or small amounts of protein-rich food. Feed sparingly and remove uneaten portions promptly, as excess food can quickly affect water quality.

Red Crystal Shrimp are best kept in a dedicated species aquarium or with very peaceful tankmates such as small otocinclus, pygmy corydoras, celestial pearl danios and other similarly gentle microfish. Snails such as nerites and small Malaysian trumpet snails are generally compatible. Avoid bettas, gouramis, larger tetras, barbs, cichlids, loaches and other fish or invertebrates that can hunt adult shrimp or their young.

Red Crystal Shrimp breed readily in mature, stable aquariums when kept in a mixed-sex group. Females carry small clusters of eggs beneath the abdomen for around three to four weeks, regularly fanning them with their swimmerets. The eggs hatch into fully formed miniature shrimp, so there is no free-swimming larval stage. Provide plenty of biofilm and moss for grazing, and avoid fish that may eat the young.

Females are typically larger and broader-bodied than males, with a more rounded abdomen and a visible saddle or developing eggs when mature. Males are usually smaller and slimmer, while colour intensity and pattern quality can vary in both sexes.