Enter your aquarium's pH, temperature, and hardness to automatically determine compatible species.
7.0 is neutral, below is acidic, above is alkaline. Most tropical fish prefer 6.0-7.5, while marine fish need 8.0-8.4. Gradual changes are essential.
Tropical fish generally prefer 22-28°C, goldfish tolerate 5-28°C, and marine fish need 24-27°C. Stable temperature is crucial.
Measures dissolved calcium and magnesium. 0-6 is soft, 7-12 is moderate, 13+ is hard water. Tetras prefer soft water, guppies prefer hard water.
Marine Fish
Tropical Fish