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Sure! Here's a complete and in-depth guide to the Siamese Algae Eater (SAE), covering everything you need to know—from identification and care to behavior and common mistakes. 🐟🌿


🐟 Siamese Algae Eater (Crossocheilus oblongus) – Full Guide


📌 Overview

Feature Detail
Common Name Siamese Algae Eater (SAE)
Scientific Name Crossocheilus oblongus (also C. siamensis, C. langei – see below)
Family Cyprinidae (minnow family)
Origin Thailand, Laos, Cambodia, Malaysia
Size Up to 6 inches (15 cm)
Lifespan 5 to 10 years (with proper care)
Type Freshwater algae-eating fish
Temperament Generally peaceful, slightly territorial with age

🧬 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

Requirement Ideal Condition
Tank Size Minimum 30 gallons for adults
Water Temperature 75–79°F (24–26°C)
pH Range 6.5–7.5
Hardness 5–20 dGH
Substrate Sand or smooth gravel preferred
Plants & Decor Heavily planted tanks with driftwood, rocks, and hiding spaces
Water Movement Moderate to high flow (they enjoy current)
Filtration Strong, well-oxygenated filtration is ideal
Lighting Moderate lighting (promotes algae growth for natural grazing)

🥗 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:

Issue Symptoms & Notes
Ich White spots, flashing
Skin wounds From poor substrate or fighting
Starvation In new tanks with no algae
Stress Due to poor water quality or small tank
Obesity From overfeeding pellets as they age and eat less algae

🧼 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

Category Detail
Size Up to 6 in (15 cm)
Lifespan 5–10 years
Water Temp 75–79°F (24–26°C)
Diet Omnivore (algae + protein)
Compatibility Peaceful community fish
Behavior Active, territorial with age
Breeding Very rare in home aquariums
Algae Control Excellent – eats BBA
Tank Level Bottom to mid-level

🧾 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.


 

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