Aquarium fish compatibility

These ratings are a simplified guide based on typical behavior, size and water (temperature, pH and hardness). Still check tank size and the temperament of individual fish 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. Also pairs whose water only overlaps at the edge of their ranges.
• Not recommended — High risk of aggression, predation, or chronic stress, or no water that suits both species — choose other tank mates.
• Insufficient data — No behaviour assessment yet. Water is compared separately, but matching water does not mean the fish will get along.