AquaStocker

Can a Betta Live With a Cardinal Tetra?

With caution — a betta and cardinal tetra can work, but watch the details.

Updated June 2026
By the AquaStocker team · How we source our data
Maybe — with caution
BettaBetta
2.8" · 5g min · 76–82°F · Semi-aggressive
+
Cardinal TetraCardinal Tetra
2.0" · 20g min · 73–81°F · Peaceful
Temperatures line up — both thrive around 76–81°F.
pH preferences overlap (6.5–7) — easy to keep both comfortable.
The betta can nip or bully a small peaceful cardinal tetra — add cover and space.
Plan on at least 20 gallons for the pair (the larger of their two minimums).

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Aquarium water test kitwatch your parametersAquarium filtermore filtration = headroomAquarium heaterstable temperature20 gallon aquariumroom for both

FAQ

Can a betta and cardinal tetra live together?
With caution — a betta and cardinal tetra can work, but watch the details. Minimum tank for the pair is about 20 gallons.

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