FishTankHelper

Serpae tetra care: tank size, temperature and tankmates

By Andy · Updated November 2, 2026 · Fish profile

Bright red and always moving. Serpaes are tough but among the nippier tetras.

1.75 in
Adult size
20 gal
Smallest tank
72–79°F
Temperature
6+
Group size

Quick facts

TypeTetra
Adult sizeAbout 1.75 inches
Smallest tank20 gallons
Temperature72–79°F
Keep6 or more
Watch forCan nip fins. Keep a full group and avoid long-finned tankmates.

How to keep them

A group of 8 or more spreads out the chasing. Keep them with fast, short-finned fish.

Like every fish, they need a cycled tank, a heater set inside their range, and a weekly water change of about 25%. Test for ammonia, nitrite and nitrate before you add them. New to this? Start with how to cycle a fish tank.

Tankmates

Good tankmates

Neon tetra · Cardinal tetra · Ember tetra · Rummynose tetra · Black skirt tetra · Harlequin rasbora · Zebra danio · Cherry barb · Tiger barb · Platy · Endler's livebearer · Molly · Swordtail · Corydoras (bronze or peppered) · Pygmy corydoras · Kuhli loach · Otocinclus · Bristlenose pleco · Cherry shrimp · Amano shrimp · Nerite snail · Mystery snail

Possible, with care

Avoid

Check a whole tank in the fish compatibility checker, or see if they fit with the stocking calculator.

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