The Siamese Algae Eater is one of the most effective and sought-after algae-eating fish in the aquarium hobby. Known for its ability to consume a wide variety of algae—including stubborn black beard algae—this active and hardy species is a valuable addition to planted and community aquariums.
With its sleek silver body, bold black horizontal stripe, and constant grazing behavior, the Siamese Algae Eater is both functional and entertaining. Unlike many other “algae eaters,” it remains relatively peaceful and continues to eat algae well into adulthood when properly cared for.
Care Guide
Tank Size
Minimum: 30 gallons
Recommended: 40+ gallons
Best kept singly or in small groups (with space)
Water Parameters
Temperature: 23–27°C (73–81°F)
pH: 6.0–7.5
Soft to moderately hard water
Appreciates clean, well-oxygenated water
Temperament
Peaceful and active
Can become slightly territorial with its own kind if cramped
Generally compatible with most community fish
Tank Mates
Suitable:
Tetras and rasboras
Gouramis
Corydoras and other peaceful bottom dwellers
Rainbowfish
Avoid:
Aggressive or highly territorial fish
Very slow or delicate species
Diet
Omnivorous
Excellent algae grazer (including black beard algae)
Supplement with:
Algae wafers
Sinking pellets
Blanched vegetables (zucchini, spinach)
Will require additional feeding as algae becomes scarce
Tank Setup
Planted tank ideal
Provide driftwood, rocks, and hiding areas
Moderate water flow mimics natural habitat
Secure lid recommended (can be active swimmers)
Behavior & Notes
Constantly on the move, grazing surfaces
One of the few fish known to eat black beard algae effectively
May become less algae-focused if overfed—balance diet carefully
Often confused with similar “false” species—true Siamese Algae Eaters have a jagged-edged black stripe that extends into the tail
Max Size
Up to 5–6 inches
Pro Tip: For best algae control, introduce Siamese Algae Eaters when young and avoid overfeeding—this encourages natural grazing behavior and keeps your tank cleaner.
