Aquarium fish compatibility

Pick a fish to see who it gets along with. Pick a second one for a pair verdict.

These ratings are a simplified guide based on typical behavior and sizes. Always check temperature, pH, footprint, and individual fish temperament before mixing species.

  • Compatible — Often kept together with attention to tank size and group sizes.
  • Caution — Possible with a large aquarium, hiding places, or experience; watch fin-nipping, temperament, or size gaps.
  • Not recommended — High risk of aggression, predation, or chronic stress — choose other tank mates.
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