Crossocheilus oblongus — Siamese Algae Eater
Family: Cyprinidae
Origin: Streams and rivers of Thailand, Laos, Cambodia, and Malaysia
Size: 12–16 cm (5–6.5 inches)
Lifespan: 8–10 years
 
Natural Habitat
Environment: Clear, fast-flowing streams and rivers with rocky or sandy substrates and submerged vegetation
Water Conditions: Well-oxygenated water with moderate current
Temperature Range: 24–26°C (75–79°F)
 
Physical Description
Body Shape: Slender, elongated body built for efficient swimming
Coloration: Silver-gray body with a bold black horizontal stripe running from nose to tail (stripe may fade depending on mood)
Fins: Transparent; simple and unmarked
 
Aquarium Care
Tank Size: Minimum 30 gallons; larger preferred for groups
Water Parameters:
pH: 6.5–7.5
Temperature: 24–26°C (75–79°F)
Water Flow: Moderate
Substrate: Sand or smooth gravel
Décor: Driftwood, rocks, dense planting; open swimming spaces important
Filtration: Good filtration with moderate current
 
Diet
Type: Omnivorous (primary algae grazer)
Preferred Foods: Algae, algae wafers, blanched vegetables (zucchini, spinach), sinking pellets, occasional live or frozen foods (bloodworms, brine shrimp)
Feeding Frequency: Once or twice daily
 
Behavior & Tank Mates
Temperament:
Peaceful and active
Best kept in groups of 5 or more to minimize territorial behavior
Compatible Tank Mates:
Peaceful community fish (Tetras, Barbs, Danios, Gouramis)
Behavior Notes:
Excellent at eating hair algae and black beard algae
May become slightly territorial as they mature if kept singly
 
Breeding
Spawning Method: Egg scatterer (breeding in aquariums is extremely rare)
Breeding Conditions:
Successfully bred in commercial farms with hormone treatments
Fry Care:
Not common in home setups