What size tank does a Porthole Catfish need?

Porthole Catfish needs a minimum of 20 gallons, with 30 gallons recommended. They are bottom swimmers. Keep in groups of 4+.

Is Porthole Catfish good for beginners?

Porthole Catfish is rated "intermediate" difficulty (2/5). Great for beginners.

What fish are compatible with Porthole Catfish?

Porthole Catfish is peaceful. Compatible tank mates include other peaceful fish with similar water parameters (pH 6-7.5, temp 72-82°F).

Porthole Catfish

Dianema longibarbis

Family: Callichthyidae • Origin: Various

Porthole Catfish (Dianema longibarbis) is a peaceful catfish reaching 4 inches. Keep in groups of 4+. Minimum tank: 20 gallons.

Min Tank

20 gal

Max Size

Temperature

72-82°F

6-7.5

Lifespan

5 years

School Size

Swim Level

bottom

Hardness

5-15 dGH

peacefulintermediateomnivoreschooling

Is Porthole Catfish Right for Your Tank?

Porthole Catfish 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. A 20-gallon tank minimum is standard — most community setups will accommodate them.

With a peaceful temperament, Porthole Catfish makes a great community fish. They coexist well with other non-aggressive species of similar size. This is a schooling species — keep at least 4 together, or they may become stressed and display abnormal behavior. Expected lifespan: 5 years with proper care.

Common Mistakes with Porthole Catfish

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Keeping fewer than 4 together

Porthole Catfish is a schooling species — they need a group of at least 4 to feel secure. Lone or paired individuals become stressed, hide constantly, and may develop health issues or aggression.

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Relying on a heater without a thermometer

Porthole Catfish 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 20 gallons

Many beginners underestimate tank size needs. Porthole Catfish requires at least 20 gallons — ideally 30. Cramped tanks lead to stunted growth, aggression, and poor water quality.