Siamese Algae Eater

The best-known consumer of black beard algae, but it grows to six inches and needs swimming room. Keep one unless the tank is large and long.

• Minimum footprint: 30 gallons; a 40+ gallon tank gives real swimming room.
• Preferred swimming zone: bottom of the water column.
• Happy alone or as a compatible pair; avoid crowding with conspecifics.
• Care level: moderate.

• Temperature: 72–82°F
• pH: 6.5–7.5
• Hardness: 5–15 dGH (Moderate)

Stable parameters matter more than perfect ones — aim for consistency before chasing an exact number.

peaceful

bottom-dwelleralgae-grazersolitarygrows-large

A herbivore / grazer — it needs plant matter and algae. Offer blanched vegetables, algae wafers, and a mature tank with surfaces to graze.

• Bronze Corydoras
• Platy
• Molly
• Kuhli Loach
• Bristlenose Pleco
• Pearl Gourami

A further 2 species pairs with Siamese Algae Eater as conditional — workable with the right tank and precautions.

• Serpae Tetra — Occasional chasing or fin nipping is possible.

Standard tanks at or above the recommended 40 gallons:

• 40 gallon Breeder 36 × 18 × 16″
• 40 gallon Long 48 × 12 × 16″
• 55 gallon 48 × 13 × 21″
• All tank sizes

• Start from a 30 gallon minimum and plan the full group size before you buy.
• Activity level is moderate, which affects how much of the tank it uses and how much it adds to the bioload.
• Zoning matters: this species lives mostly in the bottom zone, so choose tank mates that occupy other levels.

Compatibility depends on tank size, water chemistry, temperament, and adult size. Run a full check against any species in our database.

In-depth guides for Siamese Algae Eater:

• Siamese Algae Eater and Rosy BarbGood Match

• FishBase(Scientific Database, accessed 2026-09-20)
• SeriouslyFish(Specialist Publication, accessed 2026-09-20)
• Practical Fishkeeping(Specialist Publication, accessed 2026-09-20)
• Aquarium Forge editorial guidelines(Editorial Interpretation, accessed 2026-09-22)

Data reviewed: September 2026 · Data version: 2026.11
Editorial note: Minimum tank recommendations may vary by source and husbandry approach. Our figures synthesise the sources above for planning purposes.