Fish compatibility checker

"Can I keep these fish together?" Use our database to troubleshoot community setups by matching species temperament and water chemistry.

What this tool does

This checker evaluates species against our curated husbandry database. It flags mismatches in temperature, pH, and adult size, while checking for behavioral risks like fin-nipping or predator/prey conflicts.

Related tools

Aquarium Stocking CalculatorCheck gallons, bioload, adult size, and group-size pressure.Water Parameter MatcherFind species that fit your temperature, pH, GH, and KH.Tank Setup GeneratorBuild stocking ideas around your tank size and setup goal.
Blue betta in a planted freshwater aquariumNeon tetra in a freshwater aquarium
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Conditional match

This pairing can work only when the warnings are handled deliberately.

Minimum tank10 gal
Temperature overlap76-78F
pH overlap6.5-7.5
GH overlap3-10 dGH
  • schooling_size_issueNeon Tetra should be kept in a group of at least 6, not as a single add-on.

Observed photo context

Observed photos for selected species

These examples may show one or both selected species in real aquarium context. They are visual references only; the compatibility result comes from tank size, water parameters, adult size, behavior, and group-size rules.

betta in a freshwater aquarium
Blue betta in a planted freshwater aquarium.
neon tetra in a freshwater aquarium
Neon tetra in a freshwater aquarium.
Betta and retail/community tank context in a planted Betta community aquarium
Real-world aquarium context showing a Betta in a community setup.
Betta and retail/community tank context in a planted Betta community aquarium
Real-world aquarium context showing a Betta in a community setup.

Open: Betta | Neon Tetra | checker