Overview
The Siamese Algae Eater (Crossocheilus siamensis) is a freshwater fish belonging to the family Cyprinidae. It thrives at temperatures of 24–26 °C with a pH of 6.5–7.0, and requires a minimum tank volume of 110 litres. Known for its peaceful community fish; reliable algae eater, it is considered a beginner-level species. One of the only fish reliably documented to eat black beard algae (Audouinella). Water changes of 25–30 % weekly, stable parameters, and appropriate tank mates are key to long-term success with this species.
Scientific Classification
| Rank | Classification |
|---|---|
| Family | Cyprinidae |
| Genus | Crossocheilus |
| Species | Crossocheilus siamensis |
| Water type | freshwater |
Natural Habitat
Crossocheilus siamensis originates from tropical waters. It inhabits freshwater environments and is adapted to the water conditions found in its native range.
Appearance
Adults reach 12–15 cm in length. The body is freshwater and the species displays characteristic coloration suited to its environment.
Behavior
This species is described as a peaceful community fish; reliable algae eater. It does not school and can be kept individually or in small numbers. Activity level is moderate. One of the only fish reliably documented to eat black beard algae (Audouinella).
| Trait | Value |
|---|---|
| Temperament | peaceful community fish; reliable algae eater |
| Schooling | No |
| Activity level | moderate |
Water Requirements
| Parameter | Ideal Range | Notes |
|---|---|---|
| Temperature | 24–26°C (75–79°F) | Use a reliable adjustable heater |
| pH | 6.5–7 | Avoid sudden swings |
| Hardness (GH) | 5–20 dGH dGH | Soft to moderately hard |
| Ammonia | 0 ppm | Any detectable ammonia signals a problem |
| Nitrite | 0 ppm | Toxic even at low levels |
| Nitrate | <20 ppm | Manage through regular partial water changes |
| Min. tank | 110L (29 gal) | Larger tanks are easier to keep stable |
Interesting Facts
- Often confused with the Flying Fox (Epalzeorhynchos kalopterus), which does NOT eat black beard algae.
- True Siamese Algae Eaters lack the 'flap' at the corner of the mouth that Flying Foxes have.
- Juveniles eat more algae than adults, which increasingly prefer protein-based foods.
📋 Full Care Guide
Ready to set up a tank for your Siamese Algae Eater? The complete care guide covers tank setup, feeding schedule, common diseases, tank mates, and breeding.
Read Siamese Algae Eater Care Guide →Related Species
Related Species & Guides
This species profile was reviewed for biological accuracy and practical aquarium care guidance. For suspected illness or disease, test your water parameters first and consult an aquatic veterinarian if symptoms persist.