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Crossocheilus siamensis, commonly known as the Siamese Algae Eater, is a highly efficient and sought-after algae-cleaning fish native to freshwater streams and rivers of Southeast Asia, particularly Thailand and Malaysia. Known for its slender, torpedo-shaped body and a characteristic black horizontal stripe, this peaceful species plays an essential role in controlling algae growth in aquariums, including stubborn black beard algae (BBA).
Water Parameters:
Temperature: 23–28°C (73–82°F)
pH: 6.0–7.5
Hardness: 5–12 dGH (soft to moderately hard water)
Diet: While primarily algae grazers, Siamese Algae Eaters benefit from a balanced diet that includes algae wafers, blanched vegetables, and occasional live or frozen foods such as bloodworms and brine shrimp.
Tank Setup: A spacious tank with a soft substrate, driftwood, rocks, and live plants provides the ideal environment for foraging. Good water flow and aeration are appreciated, replicating their natural river habitat.
Behavior: Peaceful and active, Siamese Algae Eaters thrive in groups and are best suited for community tanks. They spend most of their time foraging along the substrate, glass, and decor.
Tank Size: Minimum of 80 liters (20 gallons) to accommodate their active swimming behavior.
Maintain stable water parameters and perform regular water changes to ensure their long-term health.
Supplement their diet with additional food sources if natural algae growth becomes insufficient.
Avoid overcrowding and provide plenty of swimming space to support their active nature.
Identify true Siamese Algae Eaters carefully, as they are often confused with similar species like Flying Fox Fish.
Tetras (e.g., Neon Tetras, Rummy-Nose Tetras)
Rasboras
Corydoras Catfish
Gouramis
Otocinclus Catfish
Peaceful Shrimp (e.g., Amano Shrimp)
Crossocheilus siamensis is an essential addition to any aquarium focused on algae control, offering both practical cleaning abilities and active, peaceful behavior. Their low-maintenance care requirements and effectiveness in tackling tough algae make them a favorite among aquarists.
