Water Quality Ranges

fish tank water quality

Here are the water quality ranges for the most common types of pet fish. Click here to find water quality requirements for more exotic fish species.

Goldfish (indoors & outdoors) Water Quality Ranges

ParameterRange
Ammonia ≤ 0.1 mg/L (ppm)
Nitrite0 mg/L
Nitrate< 20 mg/L
pH6.5-9.0
kH (alkalinity)> 100 mg/L
gH (hardness)> 100 mg/L
Temperature32-85F (0-29C)

Koi Water Quality Ranges

ParameterRange
Ammonia ≤ 0.1 mg/L (ppm)
Nitrite0 mg/L
Nitrate< 20 mg/L
pH6.5-9.0
kH (alkalinity)> 100 mg/L
gH (hardness)> 100 mg/L
Temperature32-85F (0-29C)

Betta Water Quality Ranges

ParameterRange
Ammonia ≤ 0.1 mg/L (ppm)
Nitrite0 mg/L
Nitrate< 20 mg/L
pH7.0-8.5
kH (alkalinity)> 100 mg/L
gH (hardness)> 100 mg/L
Temperature78-82F (25-28C)

General Tropicals Water Quality Ranges

ParameterRange
Ammonia ≤ 0.1 mg/L (ppm)
Nitrite0 mg/L
Nitrate< 20 mg/L
pH7.0-8.5
kH (alkalinity)> 100 mg/L
gH (hardness)> 100 mg/L
Temperature78-82F (25-28C)

Please keep in mind these are general guidelines – not all fish read the book!

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