What size tank does a Peacock Eel need?

Peacock Eel needs a minimum of 75 gallons, with 113 gallons recommended. They are bottom swimmers.

Is Peacock Eel good for beginners?

Peacock Eel is rated "intermediate" difficulty (2/5). Great for beginners.

What fish are compatible with Peacock Eel?

Peacock Eel is peaceful. Compatible tank mates include other peaceful fish with similar water parameters (pH 6.5-7.5, temp 72-82°F).

Peacock Eel

Macrognathus siamensis

Family: Mastacembelidae • Origin: Various

Peacock Eel (Macrognathus siamensis) is a peaceful other reaching 12 inches. Can be kept singly. Minimum tank: 75 gallons.

Min Tank

75 gal

Max Size

12"

Temperature

72-82°F

6.5-7.5

Lifespan

14 years

School Size

Solo OK

Swim Level

bottom

Hardness

5-15 dGH

peacefulintermediatecarnivore

Is Peacock Eel Right for Your Tank?

Peacock Eel is an excellent choice for beginners — rated "intermediate" difficulty (2/5). They're hardy, forgiving of minor water parameter fluctuations, and generally easy to feed. They need at least 75 gallons — a mid-size tank commitment. Plan your space accordingly.

With a peaceful temperament, Peacock Eel makes a great community fish. They coexist well with other non-aggressive species of similar size. Expected lifespan: 14 years with proper care.

Common Mistakes with Peacock Eel

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Relying on a heater without a thermometer

Peacock Eel needs 72–82°F. Heaters malfunction or drift over time — always use a separate thermometer to verify. Temperature swings of even 3–4°F can trigger stress and disease, particularly ich.

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Putting them in a tank under 75 gallons

Many beginners underestimate tank size needs. Peacock Eel requires at least 75 gallons — ideally 113. Cramped tanks lead to stunted growth, aggression, and poor water quality.

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Skipping the quarantine period

Even healthy-looking fish can carry parasites or disease. Quarantine new Peacock Eel for 2–4 weeks in a separate tank before adding to your main aquarium.