Description
The Purple Galaxy Shrimp (Caridina cf. cantonensis) is a rare and visually striking freshwater dwarf shrimp prized for its deep purple body and shimmering “galaxy” spots across the head and back. A high-grade variant of the Taiwan Bee shrimp group, this species is sought after by advanced hobbyists for its vivid coloration, unique patterning, and sensitivity to water conditions. Its peaceful nature and small size make it ideal for dedicated, species-only aquascapes with stable parameters and minimal bioload.
Features of the Purple Galaxy Shrimp
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Grows up to 2.5–3 cm in length
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Rich purple coloration with iridescent star-like spots, especially on the head (“galaxy” pattern)
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Highly sensitive to water quality and stability
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Peaceful and social; thrives in colonies
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Lifespan of 1.5–2 years with optimal care
The best aquarium size for the Purple Galaxy Shrimp
A mature, stable nano tank of at least 20 litres is suitable for a small colony. For long-term success and breeding, 40–60 litres or more is recommended to ensure consistent water parameters and temperature stability.
Tank Mate Compatibility for the Purple Galaxy Shrimp
Due to their size and sensitivity, tank mates must be peaceful, shrimp-safe, and non-predatory. Best kept in species-only tanks, but can be cohabited with select species:
Diet for the Purple Galaxy Shrimp
Omnivorous and scavenging by nature, this species benefits from a varied, shrimp-safe diet:
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High-quality shrimp-specific pellets and wafers
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Blanched vegetables (spinach, zucchini, kale)
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Biofilm and algae (naturally occurring in mature tanks)
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Occasional protein sources such as powdered baby shrimp food or crushed bloodworms
Avoid overfeeding and remove excess food to prevent water quality issues.
Aquarium Setup Purple Galaxy Shrimp
Aquarium Filtration
Use a gentle sponge filter or a canister filter with a pre-filter sponge to prevent shrimp from being sucked in. Filtration must ensure pristine water without creating strong current.
Aquarium Plants
Dense planting is encouraged. Mosses like Java Moss and Flame Moss promote biofilm growth and offer shelter. Floating plants help diffuse light and improve water quality.
Aquarium Lighting
Moderate to low lighting is preferred to prevent algae overgrowth and reduce stress. LED systems with adjustable output are ideal for planted shrimp tanks.
Aquarium Heating
Maintain temperature between 20°C and 24°C. Use a precise, adjustable heater with a digital thermometer. Avoid fluctuations, which can stress or kill shrimp.
Aquarium Substrate
Use active buffering substrates designed for Caridina shrimp, such as ADA Amazonia or other shrimp-specific soils, to maintain pH between 5.8 and 6.5.
Aquarium Decorations
Use natural decor like cholla wood, Indian almond leaves, and mineral stones. These provide biofilm surfaces, shelter, and beneficial tannins for health and coloration. Avoid copper-containing materials.
