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Red Ruby Shrimp
Caridina logemanni
📍 Taiwan / Germany selective breeding
Red Ruby Shrimp are a selectively bred variety of Caridina logemanni prized for their deep crimson-red coloration that intensifies with proper care and diet. These small, active shrimp display a solid red body with minimal pattern, making them visually striking in planted aquariums. They are excellent algae grazers and biofilm consumers, ideal for establishing healthy, balanced freshwater ecosystems.
Care Guide
Diet
Red Ruby Shrimp are detritivores that thrive on biofilm, algae, and decaying plant matter naturally present in established tanks. Supplement with high-quality shrimp-specific foods such as Shirakura, Mosura, or similar mineral-rich pellets 2-3 times weekly. Occasional blanched vegetables (spinach, zucchini) and dried leaves (Indian almond, oak) enhance nutrition and color intensity.
Behavior
Red Ruby Shrimp are active grazers, constantly foraging along substrate and plant surfaces for food. They are social and do best in groups, displaying natural hierarchies and molting cycles every 4-6 weeks. Males are smaller and more active; females are larger and spend more time in sheltered areas during breeding.
Breeding
Red Ruby Shrimp require soft, acidic water (pH 5.5-6.5, GH 4-6) to breed successfully. Females produce small batches of 20-30 shrimplets that develop in the mother's saddle without a free-swimming larval stage. Juveniles are tiny and require abundant biofilm and fine foods; survival rates improve in heavily planted tanks with minimal predation.
Tank Mates
Small, peaceful algae eater; shares biofilm grazing niche without competing aggressively
Tiny, non-predatory fish; may occasionally consume shrimplets but generally safe with adults
Nano fish that coexist peacefully; minimal bioload and no predatory behavior toward shrimp
Larger shrimp species; may compete for food but generally compatible in established colonies
Provides shelter, biofilm growth, and breeding habitat; essential for colony success
Common Diseases
Molting Failure / Incomplete Molt
Shrimp unable to shed exoskeleton; stuck in old shell; lethargy; death within 24-48 hours
Increase mineral content via GH booster or specialized shrimp mineral supplements; ensure pH 5.5-6.5 and adequate calcium; perform 25% water change with remineralized water
Muscular Necrosis (MSC)
White, opaque patches on body and appendages; loss of color; paralysis; rapid decline
Maintain stable water parameters (pH, GH, temperature); increase water change frequency; add Indian almond leaves for tannins; no proven cure; isolate affected individuals
Vorticella / Fungal Infection
White, cotton-like growth on body; lethargy; difficulty molting; cloudy appearance
Perform 50% water change; increase aeration; add Indian almond leaves or oak leaves for tannins; maintain pristine water quality; remove severely affected shrimp to prevent spread
Copper Toxicity
Sudden death; erratic swimming; color loss; paralysis
Avoid all copper-based medications and fertilizers; use copper-free plant fertilizers only; perform immediate 50% water change if copper exposure suspected; use activated carbon in filter
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Quick Facts
- diet
- detritivore/omnivore - biofilm, algae, plant matter, specialized shrimp pellets
- lifespan
- 1-2 years
- max size
- 3 cm (1.25 in)
- tank size
- 5 gallons minimum
- temperament
- peaceful
Water it likes
- ph
- 5.5-6.5
- ammonia
- 0 ppm
- nitrate
- <20 ppm
- hardness
- 4-6 dGH
- temperature
- 72–79°F (22–26°C)