Siamese algae eater

Siamese Algae Eater (Crossocheilus siamensis) – Aquarium Care Guide

The Siamese Algae Eater is a highly effective algae-eating fish, perfect for keeping your aquarium clean. Known for consuming black beard algae, this fish is active, hardy, and an excellent choice for community tanks. Juveniles are gregarious and schooling, while adults form a hierarchy and should be kept in groups of at least 6 to reduce stress and aggression.

Appearance & Behavior

Body: Sleek, silver with a distinct dark lateral stripe

Size: Up to 6 inches (15 cm)

Temperament: Generally peaceful, may become territorial with similar species as adults

Activity: Very active, constantly grazing on algae

Tank Setup & Water Conditions

Minimum Tank Size: 50 gallons

Temperature: 72°–79° F (22°–26° C)

pH: 6.5–7.5

KH: 4–15 dKH

Habitat: Provide moderate to high water flow, ample cover, and secure lid

Diet

Primarily herbivorous

Feeds on algae, high-quality vegetable-rich flakes, pellets, and fresh vegetables like zucchini or cucumber

Limit meaty foods

Tankmates & Compatibility

Peaceful with most fish and larger invertebrates

Avoid very small shrimp and tiny invertebrates as they may be eaten

Safe with snails

Key Features

Efficient algae cleaner, including black beard algae

Hardy and adaptable to various water conditions

Active and noticeable in the aquarium

Suitable for community and planted aquariums