Siamese Algae Eater

The Siamese Algae Eater (Crossocheilus oblongus) is a freshwater schooling fish valued for a slim torpedo-shaped algae grazer with a dark lateral stripe extending through the caudal area. Native to Southeast Asia, this species is popular in planted community aquariums because it combines visual impact with manageable care requirements. It remains one of the most useful fish for practical algae management in planted tanks.

Appearance and Coloration

Siamese Algae Eater is known for clean pattern definition and color response that improves under stable water quality, varied feeding, and proper group size. In mature planted aquariums, the body pattern reads clearly even during fast schooling movement.

Size and Lifespan

• Adult size: 16 cm (6.3 inches)
• Typical lifespan: 6-10 years with stable parameters and quality diet
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Ideal Aquarium Setup

This species performs best in a biologically mature aquarium that prioritizes oxygenation and stable chemistry.

• Tank size: 40 gallons (150 L)
• Temperature: 24-26 C (75-79 F)
• pH: 6.5-7.5
• Aquascape direction: strong oxygenation, smooth hardscape surfaces, and stable planted growth

Behavior and Temperament

Siamese Algae Eater is an industrious algae grazer that is generally peaceful in established groups. Keep groups of at least 5+ individuals so hierarchy and movement are distributed naturally. Good companion options include peaceful medium community fish that are not overly delicate or slow.

Diet and Feeding

Siamese Algae Eater is classified here as Herbivore. Build a varied schedule with high-quality staple foods, plus frozen or live options several times per week. A rotating diet supports immunity, activity, and stronger display color.

Breeding Notes

Most cyprinids in this group are egg scatterers. Conditioning with diverse foods and offering fine-leaved plants or spawning media can improve egg survival. If breeding is the goal, move adults after spawning to reduce egg predation.

Why Keep Siamese Algae Eater in a Planted Aquarium?

Siamese Algae Eater provides movement, contrast, and schooling structure that helps a layout feel alive without overpowering the design. For aquascaping-focused community tanks, it is a practical and visually rewarding choice.