Water Quality Ranges

fish tank water quality

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

Goldfish (indoors & outdoors)

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

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

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

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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