Siamese Algae Eater (Crossocheilus oblongus) Care Guide
Active Southeast Asian cyprinid noted for consuming red algae, including black brush algae. A valuable but large algae-eater for planted community tanks.
Overview
Crossocheilus oblongus is a slender, active cyprinid native to mainland Southeast Asia. It is reported to be one of the few aquarium fishes that will consume red algae, including black brush or beard algae, making it especially valued in planted aquaria.
Taxonomy
- Family: Cyprinidae
- Genus: Crossocheilus
- Scientific name: Crossocheilus oblongus
Habitat
Native to the Chao Phraya and Mekong basins and the Malay Peninsula, inhabiting streams, rivers and seasonally flooded forests. The species is typically found in well-oxygenated waters with moderate flow and dense submerged vegetation.
Tank requirements
- Minimum tank volume: 120 L
- Temperature: 24-26 °C
- pH: 6.0-7.5
- GH: 5-15 °dGH
- Lifespan: 8-10 years
- Adult size: 10-14 cm
Diet
Primarily herbivorous but opportunistic. The species grazes filamentous and red algae from plants and decor and accepts sinking pellets, algae wafers, blanched vegetables and occasional frozen invertebrates. As individuals mature they tend to consume less algae and may need a more varied diet.
Compatibility
Active and generally peaceful, although individuals can show aggression toward conspecifics and similarly shaped fish such as Red-Tailed Shark. Best kept singly or in small groups in spacious tanks. Suitable tankmates include Corydoras, tetras, larger barbs and Angelfish.
Breeding
Captive breeding is rarely achieved without hormonal induction; almost all aquarium specimens are commercially farmed. The species spawns as an egg-scatterer in flowing water.
Conservation status
IUCN Red List: Least Concern. The species is widely distributed and abundant in much of its native range.