Moderate

Chinese Algae Eater

By The Aquarium Calculators Editorial Team ·

Gyrinocheilus aymonieri

Complete Chinese Algae Eater care guide covering omnivore diet requirements, semi-aggressive temperament, minimum 30 Gallons tank setup, and compatible freshwater tankmates. Difficulty: Moderate.

Chinese Algae Eater

Quick Answer

Chinese Algae Eater (Gyrinocheilus aymonieri) is often sold as a small algae-eating fish, but it grows large and becomes territorial, often harming tankmates.. It requires a minimum 30 Gallons aquarium with a pH of 6.5 - 7.5 and temperature range of 22-26°C. As a omnivore with semi-aggressive tendencies, careful tankmate selection is essential.

Intro

Chinese Algae Eater (Gyrinocheilus aymonieri) is often sold as a small algae-eating fish, but it grows large and becomes territorial, often harming tankmates.

Setup

A 30-gallon or larger tank with plenty of hiding spots and robust filtration. Provide caves and smooth rocks. They need well-oxygenated water with current.

Feeding

Omnivorous; juveniles eat algae, but adults prefer meaty foods (bloodworms, shrimp pellets) and may stop eating algae entirely.

Compatibility

Semi-aggressive. Only keep with similarly sized, robust fish. Avoid slow-moving or flat-bodied fish. Best in a species tank or with large barbs, danios.

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Tank Position
Bottom
Water Temp
22-26°C
Adult Size
See profile
Water pH
6.5 - 7.5

Species Characteristics

Adult Size
Lifespan
Growth Rate
moderate
Tank Compatibility
Community compatible
Indoor Aquarium
Yes

Water Parameters

Water Temperature
Humidity
Water pH

Tank Lighting

Tank Lighting
Standard lighting
Light Hours
N/A
Intensity
moderate

Feeding & Diet

Diet Type
Diet: Omnivore
Feeding Schedule
N/A
Live Food Options
N/A

Frequently Asked Questions

How many Chinese Algae Eaters can be kept together?
Keep strictly one per aquarium, even in tanks over 100 gallons (378 liters). Chinese algae eaters (Gyrinocheilus aymonieri) are highly territorial and become aggressive with age, attacking conspecifics and other fish by sucking their slime coat. Two individuals in any size tank will fight to severe injury, causing open wounds and secondary infections. A single adult requires a minimum of 50 gallons (189 liters) with a footprint of 48x15 inches (120x38 cm). Provide multiple caves and driftwood to establish territory. Avoid with slow-moving or flat-bodied fish (discus, angelfish).
What are the exact water parameters for Chinese Algae Eaters?
Target pH 6.5 - 7.5, General Hardness 5 - 15 dGH, Carbonate Hardness 4 - 12 dKH, Total Dissolved Solids 150 - 400 ppm, Electrical Conductivity 300 - 800 μS/cm, and temperature 72°F - 80°F (22°C - 27°C). They are hardy but require excellent filtration for their waste output. Maintain nitrates below 25 ppm with weekly 30% water changes. Use a canister filter rated for 2x tank volume. Provide high oxygenation with powerheads. Smooth substrate (sand or rounded gravel) to protect their undersides. Avoid copper-based medications.
What is the nutritional and medication protocol for Chinese Algae Eaters?
Juveniles are herbivorous (80% algae), but adults become omnivorous with a preference for protein. Feed sinking algae wafers, spirulina tabs, blanched zucchini, and cucumber daily. Supplement with sinking pellets, bloodworms, and brine shrimp twice weekly. They will attack fish to eat slime coat if underfed. Medication alert: Extremely sensitive to copper (0.1 mg/L lethal) and formalin. Scaleless; use malachite green at quarter dose. Praziquantel is safe. Avoid salt (tolerance <2 ppt). Quarantine with metronidazole at half-strength.
How to breed Chinese Algae Eaters in captivity?
Breeding is very rare in home aquariums (requires >200 gallons/750 liters and hormonal stimulation). To attempt, condition a group of 6 adults with high-protein foods (bloodworms, krill) for 4 weeks. Simulate rainy season: Lower temperature to 68°F (20°C), perform 50% water change with cool RO water over 6 hours, increase water flow. They are egg-scatterers; provide PVC pipes and smooth stones. Females release 10,000-20,000 eggs. Remove parents after spawning. Eggs hatch in 24-36 hours. Fry require green water for 10 days, then baby brine shrimp. Not recommended for hobbyists.