What size tank does a Disk Tetra need?

Disk Tetra needs a minimum of 75 gallons, with 113 gallons recommended. They are middle swimmers. Keep in groups of 5+.

Is Disk Tetra good for beginners?

Disk Tetra is rated "advanced" difficulty (3/5). Suitable for intermediate fishkeepers.

What fish are compatible with Disk Tetra?

Disk Tetra is peaceful. Compatible tank mates include other peaceful fish with similar water parameters (pH 6-7.5, temp 75-82°F).

Disk Tetra

Myleus schomburgkii

Family: Characidae • Origin: Various

Disk Tetra (Myleus schomburgkii) is a peaceful tetra reaching 10 inches. Keep in groups of 5+. Minimum tank: 75 gallons.

Min Tank

75 gal

Max Size

10"

Temperature

75-82°F

6-7.5

Lifespan

15 years

School Size

Swim Level

middle

Hardness

5-15 dGH

peacefuladvancedherbivoreschooling

Is Disk Tetra Right for Your Tank?

Disk Tetra is a moderate-care fish rated "advanced" (3/5). Suitable for hobbyists with some experience who can maintain stable water parameters. They need at least 75 gallons — a mid-size tank commitment. Plan your space accordingly.

With a peaceful temperament, Disk Tetra makes a great community fish. They coexist well with other non-aggressive species of similar size. This is a schooling species — keep at least 5 together, or they may become stressed and display abnormal behavior. Expected lifespan: 15 years with proper care.

Common Mistakes with Disk Tetra

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Keeping fewer than 5 together

Disk Tetra is a schooling species — they need a group of at least 5 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

Disk Tetra needs 75–82°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. Disk Tetra requires at least 75 gallons — ideally 113. Cramped tanks lead to stunted growth, aggression, and poor water quality.