These are estimates only. Aquarium stocking is not an exact science—individual fish behavior varies greatly, and every tank is unique.

⚠️ Size differences matter: Large fish may kill or eat smaller tank mates. Always research compatibility and watch for aggression.

🔍 Do your research: This calculator is a starting point. Please research each species' specific needs, temperament, water parameters, and compatibility before purchasing.

Overstocking can lead to poor water quality, stress, disease, and fish death. When in doubt, stock conservatively.