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Create the perfect balanced ecosystem for your fish. Avoid overstocking and compatibility issues with our scientifically-backed calculator.
Start Calculating NowCalculate tank volume from dimensions for precise stocking
Detailed filtration capacity assessment
Visual fish compatibility indicators
Custom water change schedule based on your tank
Recommended: 20+ gallons for most community fish
Important: Higher filtration allows for more fish
Results based on your tank configuration
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Temperature compatibility results will appear here.
For a 40-gallon freshwater tank: 12 Neon Tetras, 6 Corydoras, 2 Dwarf Gouramis
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Detailed information on freshwater and saltwater fish species. Find the perfect fish for your aquarium.
Creating a balanced aquarium ecosystem requires understanding several key factors. This comprehensive guide will help you build a thriving aquatic environment.
The size of your aquarium directly affects how many fish you can safely keep:
Different fish require specific water conditions to thrive:
| Fish Type | Temperature (°F) | pH Level | Water Hardness |
|---|---|---|---|
| Tropical Community | 75-80°F | 6.5-7.5 | Soft to Medium |
| Goldfish | 65-72°F | 7.0-7.8 | Medium to Hard |
| African Cichlids | 78-82°F | 7.8-8.5 | Hard |
| Marine Fish | 75-80°F | 8.1-8.4 | Hard (Saltwater) |
Creating a harmonious community requires understanding which fish can live together:
As a general guideline, you can stock about 1 inch of fish per gallon of water in a freshwater tank. However, this varies based on fish species, filtration, and tank setup. Our calculator provides a more accurate assessment based on your specific configuration.
While possible in very large tanks, angelfish may see neon tetras as prey in smaller setups. We recommend avoiding this combination in tanks under 50 gallons. Our compatibility matrix will flag such problematic pairings.
For new tanks, test water parameters 2-3 times per week. For established tanks, once a week is sufficient. Always test after adding new fish or making significant changes to your tank.
Beginner aquarists should aim for 70-80% of the maximum stocking capacity. This provides a buffer for learning and helps maintain stable water conditions.