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!

Subscribe to get more tips and info about fish.

Share with your friends!

Get This FREE Download

The Top 10 Mistakes Fish Owners Make

We'll never share your email. Unsubscribe any time. 

Top 10 Mistakes

Get This FREE Download

The Top 10 Mistakes Fish Owners Make

We'll never share your email. Unsubscribe any time. 

Top 10 Mistakes
Share to...