🐟 Siamese Algae Eater (Crossocheilus oblongus) – Full Guide

📌 Overview

🧬 Species Identification & Lookalikes

Many fish are mislabeled as Siamese Algae Eaters. Here's how to identify the real SAE:

✅ True SAE (Crossocheilus oblongus):

• Black horizontal stripe runs from nose through tail into the tail fin (transparent)

• Lacks barbels (whisker-like appendages near the mouth)

• Mouth faces downward, adapted for scraping

• Body: Slim, torpedo-shaped

❌ False SAE (Flying Fox, Epalzeorhynchos kalopterus):

• Black stripe ends before the tail fin

• Gold or bronze stripe above the black one

• Has barbels

• More aggressive and does not eat black beard algae (BBA)

❌ Chinese Algae Eater (Gyrinocheilus aymonieri):

• Larger and more aggressive

• Sucks onto tank mates

• Not suitable for most community tanks

🧠 Behavior & Temperament

• 🧘 Peaceful when young, but may become territorial with age

• 👥 Best kept alone or in a small group (3–5 in a large tank)

• 🧽 Constantly grazing on algae and debris

• 🧍 Bottom and mid-level swimmer

• 💤 Stripe fades when resting or stressed (normal behavior)

🏠 Tank Requirements

🥗 Diet

Siamese Algae Eaters are omnivores but lean heavily toward plant-based foods.

✅ What They Eat:

• 🧽 Algae: Soft green algae, diatoms, black beard algae (BBA) ✅

• 🥬 Blanched vegetables (zucchini, spinach, cucumber)

• 🍘 Algae wafers

• 🐛 Protein (occasional): Bloodworms, brine shrimp, daphnia

• 🥣 Sinking pellets and tablets (balanced omnivore type)

⚠️ Note: As they age, they may eat less algae and more prepared foods. A well-rounded diet is essential.

🐣 Breeding

Breeding Siamese Algae Eaters in home aquariums is extremely rare.

• ✅ Farms use hormonal induction for reproduction

• ❌ No reliable natural breeding success in home setups

• 🧬 Sexing is difficult – females may appear slightly rounder

• 🪺 No known parental care behavior

🧑🤝🧑 Tankmates

✅ Best Tankmates:

• Peaceful community fish:

  • 🐠 Tetras

  • 🐚 Corydoras

  • 🐟 Mollies

  • 🐡 Gouramis

  • 🦐 Shrimp (if the SAE is well-fed)

❌ Avoid with:

• 🐊 Aggressive cichlids (Oscars, Jack Dempsey, etc.)

• 🪓 Fin-nipping fish (Tiger Barbs in small tanks)

• 🐍 Predatory loaches or large aggressive fish

⚕️ Health & Common Issues

✅ Generally Hardy, but can suffer from:

🧼 Prevention Tips:

• Keep water quality stable

• Supplement diet after algae runs low

• Quarantine new fish before introducing

🧠 Fun Facts

• 🦠 One of the very few fish that eat black beard algae (BBA)!

• 🔄 Their stripes fade when they rest or are stressed (normal, not illness)

• 🚫 Often mislabeled in pet stores — proper ID is essential

• 💪 Can jump! Use a tight-fitting lid

📊 Quick Facts Table

🧾 Summary

The Siamese Algae Eater is a fantastic choice for mid- to large-sized community aquariums. They’re one of the only species that eat black beard algae, making them highly valued. While peaceful in youth, they may become territorial with age. Always double-check species identity, feed them a varied diet, and keep them in a mature, stable tank.

IMAGES ARE FOR REPRESENTATIVE PURPOSES ONLY.