Does Water pH Level Affect Guppies?

Guppies are generally easy fish to care for, that is why they are a great choice for both beginners and experienced aquarium owners. Guppies don’t have extreme or difficult environmental demands. They are hardy fish and can accept a wide range of environmental variations including pH levels.

The water pH level of guppies is best kept neutral or slightly basic. It should be maintained between the ranges of 6.8 to 7.8. As much as guppies can cope in a wide range of environment, they can still be affected by too acidic or too basic pH levels. So, YES guppies are affected by the pH level of the water they are kept in. Guppies and livebearers in general don’t like soft acidic water. Therefore, 

Does Water pH Level Affect Guppies

Guppies have a remarkable ability to a wide range of environmental variations. Guppies don’t necessarily require very large space, they even fit into an environment having small gallons of water. You can easily maintain guppies by simply keeping their environment clean, feeding them well, and avoid conditions that can get them stressed.

Ensuring that the environmental conditions of your guppies are favourable is essential. It is good enough that you can easily monitor the pH level of water by taking simple pH measures. Likewise, you can always keep the pH level in check by monitoring all factors that can influence the water pH level to go too high or too low.


How To Measure Water pH Level

Water pH is simply defined as the level of acidity or alkalinity of water. You must ensure that the water pH of your guppies are favourable for you to get the best out of them. Guppies can live up to 4 years and produce many fries if their environmental conditions are favourable.  You can monitor the water pH level in your aquarium with simple techniques.

How to measure water pH level is not rocket science, it is something that can easily be done by anybody. To check water pH level, you can either make use of pH tester strip (chemical tester) or a digital pH meter. Many people choose the strip method of measuring pH over the digital method because it is relatively inexpensive. However, strips also expire after some time and consequently might not show good results. Thus, digital pH meter might be a better choice in the long run.

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pH Measurement Using pH Meter 

If you are using the digital pH meter, you first calibrate it using a supplied solution. After calibration, dip the digital tester in your aquarium tank to get your reading. Digital pH meters give very precise and accurate results if it is properly calibrated. In general, digital pH meters are more expensive and also more reliable.

pH Measurement Using pH Testers

The use of pH testers is quite easy as well. This strips will only require you to take a sample of the water you wish to test and test it with the chemical supplied with the kits. Then dip the strip into the sample and watch out for colour change on the strip. Afterwards, compare the colour of the strip to the colour chart supplied with the kit. This method is relatively inexpensive. It requires careful examination of the colour change, making the result less reliable.

You can perform a simple litmus paper test. This method is however not so reliable and therefore not often recommended. This is because the colour change will only tell  you the acidity or basicity of the water and not the exact pH reading.

Factors That Can Influence pH Levels In Fish Aquariums

There are several factors that can alter the pH level of your aquariums. These factors are capable of increasing or reducing the pH level of your aquarium. Extremely high or low pH can affect the overall wellbeing of your pet guppy. This is why it is very important that you monitor the pH changes in your aquarium. Also, you should keep the factors that can alter it in check.

Water Aeration

One of the major factors that influence the water pH level of aquarium is aeration of water. Water aeration can lower the pH levels in the tank. It is important that you ensure the proper aeration of your tank to keep the pH balanced. Likewise, carbon dioxide and the presence of live plants will lower the pH levels of the aquarium. This is because carbon dioxide is an acidic gas. This compound increase the acidity of water when it dissolves in it.

Similarly, overcrowding of tank can contribute to the reduction in the pH level of the aquarium. This is because of the large number of wastes released by these fishes. The acidic nature of these metabolic waste can trigger a significant drop in the water pH level of the tank. Likewise, overcrowding prevents proper aeration thus leading to a significant drop in the pH level of the aquarium.

Organic Factors

Also, organic compounds contribute significantly to the increase in the pH level of water in the aquarium tank. Examples of these compounds are aquarium salt, crushed coral, limestone substrates, and seashells. They are known to have basic constituents which can in turn affect the pH level of an aquarium tank to become more basic.

Keeping these factors in check can means keeping the pH level of your tank in check.


Guppies are easy to keep even for beginners because of their high tolerance for environmental variation. They can cope with various changes in their environment as long as it is not too extreme and they don’t get stressed. As much as guppies can cope with varying conditions, they can still be affected by extremely high or low pH. In fact, guppies and other life bearers in general detest soft acidic water.

pH is one of the most important environmental factors in an aquarium, and it is possible to monitor the pH level of the tank using two popular techniques. The two commonly used techniques are the digital meter and pH strip testers. However, you can also keep the pH level of your tank in check by watching out for certain factors that can alter the pH level of water.


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