Fish Compatibility Checker

Sometimes. A single male betta can work with small, fast, non-flashy tank mates in a 15+ gallon planted tank — but it depends on the individual. Never keep male bettas together, and avoid fin-nipping species or other surface-dwelling anabantoids.

We do not recommend it. Adult angelfish routinely eat adult neon tetras — in the wild, neons are a natural prey item. Larger tetras like black skirt tetras, or deeper-bodied rasboras, are safer mid-level companions.

Water chemistry (no overlap in temperature or pH ranges), adult size ratios (a fish that fits in another's mouth eventually will be in it), and activity mismatch — hyperactive danios stress slow, long-finned fish even without direct aggression.

Good Match means the ranges and behaviour line up with no meaningful risk. Conditional means it can work with specific precautions — enough tank size, plants and sight breaks, and the right group sizes. Risky flags a clear behavioural or size concern that needs close watching. Not Recommended means the conflict is not solved by adding space, such as fin-nipping or outright predation.

Rearrange decorations before adding newcomers (to reset territories), add fish after lights-out, feed well beforehand, and watch closely for the first few days. Have a separation plan ready — a breeder box or a second tank.