Water Quality Checker
Enter your aquarium's pH, temperature, and hardness to automatically determine compatible species.
Water Parameter Basics
pH（水素イオン濃度）
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.
Temperature
Tropical fish generally prefer 22-28°C, goldfish tolerate 5-28°C, and marine fish need 24-27°C. Stable temperature is crucial.
GH（General Hardness）
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.
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