What Are the Ideal Water Parameters for Guppies?

Guppies (Poecilia libestes reticulata) are one of the most popular fish species for beginners.

Guppies are quite hardy and can easily adjust to fluctuations as per water conditions than similar fish species.

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When it comes to keeping fish, we always think about the big guys – like goldfish and cichlids. But what about the little guys? Guppies are one type of fish that can be kept in a small tank or even in a bowl – and they’re great for beginners!

In this article, we’re going to discuss some of the ideal water parameters for guppies. Keep in mind, that these parameters will vary depending on the specific fish you have, so make sure to check with your breeder or pet store before setting up your tank!

What is Guppy Water?

When choosing water for your guppy, consider its pH level and specific gravity. Guppies need neutral water with a pH level of 7.0-7.6.

At the same time, the water should have a specific gravity of 1.020-1.023 to provide the correct amount of sustenance for your guppy. Additionally, make sure the water is clean and free of pollutants.

Basic water chemistry

There are 3 main parameters that need to be taken into consideration when creating ideal conditions for guppies.

These parameters are pH of water, tank temperature, and water hardness.

Maintaining pH Levels

pH is a measure of the alkalinity or acidity of a particular substance.

It is measured on a scale of 1-14 with 7 being the neutral pH.

Acidic pH refers to values that are lower than 7 while figures higher than 7 are alkaline or basic. On other hand Ordinary House Tap water has a pH level of 7.

However, the water in your tank has different pH because of the chemicals dissolved or suspended in the water.

Different species of fish thrive in different levels of Ph. While guppies do best when pH ranges from 7 to 8. So, it is quiet important to look out for symptoms of low ph in fish tank.

Water hardness

Although water hardness is a crucial parameter for the survival and growth of guppies, many aquarium owners often neglect its significance.

Fish thrive in a specific range of water hardness, and when these levels are not achieved, it can cause stress and possibly death.

Water hardness simply refers to the total dissolved minerals in any type of water.

Hard water is the term used when there is a high level of dissolved minerals, while soft water has a low mineral level.

It is important that you appreciate the relationship that exists between your water pH and hardness.

Hard water usually has high pH because the minerals present act as buffers thereby reducing the amount of acid (pH) in the water.

The ideal water hardness range for guppy fish is GH 8-12.

Temperature for guppies

Besides Water Ph and Hardness its temperature is equally important for your guppy and tank mates.

Fish and live tank plants can only tolerate a limited range of temperature or water variations.

Water temperature consistency is pretty important here, Sudden changes in water temperature can often result in health issues and diseases over time.

The ideal range of water temperature for guppy fish is between 10°C to 29 °C or it’s equivalent (50°F to 85°F);

Guppy fry thrive best at 25.6 °C (78°F)

Juvenile at 24.4 °C (76°F)

For adult Guppies 23.3 °C (74°F)

How to Test Your Aquarium’s Guppy Water Parameters

The best way to test your guppy’s water parameters is to fill a small pot with tap water and set it in the tank. You can also use a pH meter to measure the water’s acidity or alkalinity.

Make sure that the temperature of the water is between 68 and 78 degrees Fahrenheit. If your guppy is getting along well with its current water parameters, you don’t need to adjust them. If your guppy is not thriving, however, you may need to make adjustments.

Water changes are one of the simplest ways to improve your guppy’s environment and health. Change 25 percent of the tank’s water every two weeks during the warmer months and every week during the cooler months. Test the water for ammonia, nitrite, and nitrate levels before and after each change. If your readings are high, perform a larger water change.

If you’ve tried changing your guppy’s water parameters and your guppy still isn’t thriving, consider adding aquatic plants or an aquarium filter to help clean the fish’s water. Guppies thrive in environments with plenty of plant life, so adding some healthy flora will likely help your guppy feel more at home in its new home.

What Water Parameters are Best for Guppies?

Water parameters are important for any fish, but especially for guppies. Guppies require a variety of water parameters to thrive, including a pH of 6.5-7.5, temperature of 76-82 degrees Fahrenheit, and a concentration of 1-5parts per thousand (ppt). Some other helpful water parameters for guppies include hardness (GH), alkalinity (AC), and silicate (Si).

How to Change Water Parameters for Guppies

When you first get a Guppy, they will need room to swim and breed. One of the most important things you can do is to set the water parameters for your aquarium. The right parameters will provide your Guppy with optimal living conditions. You should check the water parameters regularly and adjust them as needed.


Water parameters are essential for the health and well-being of guppies. By understanding what water parameters are necessary and when they should be adjusted, you can provide your guppies with a healthy aquatic environment that will support their growth and development.

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