Does Guppies Need a Heater: A Comprehensive Beginner’s Guide

Does guppies need a heater? If you’ve been looking for the answer to whether or not guppies need a heater, look no further.

In this comprehensive guide, we’ll explore the various benefits that a guppy tank with a heater offers and why it could benefit your pet fish.

Guppies are one of the most popular aquarium fish – but their needs sometimes must be better understood.

Many aquarium owners must realize their tanks require a heater to keep the guppies comfortable and healthy.

No matter what temperature range you’re starting from, understanding heaters can be key in providing your beloved little guppies with the best environment.

How to make a guppy breeding tank

Without proper heating, your guppies can become ill, suffer from stunted growth, and eventually die. This can easily be avoided if you know what you need and have the right equipment installed in your tank.

Read on to learn more about how having the right heating system setup can keep your tank thriving and its inhabitants healthy.

Does Guppies Need a Heater in Their Tank?

Yes, guppies need a heater in their tank. Guppies are tropical fish from South American rivers and lakes with warm water temperatures between 72-82° F (22-28° C).

In-home tanks without a heater, the temperature may fluctuate significantly due to changes in the surrounding environment. This is uncomfortable for your fish and can reduce their lifespan by causing stress.

It’s essential to install a heater in their tank so they can remain comfortably at the optimum temperature range all year round.

Can Guppy Survive Without a Heater?

Do guppies need a heater in their tank? Guppies are hardy fish, but if they are kept in too cold water, they can become stressed, sick, or even die. It is important to monitor the temperature of your guppies tank water. To keep your guppies healthy and active

How to breed guppies

If the water temperature drops below 68 degrees F, your guppies may become sluggish and inactive. So, while guppies can survive without a heater, it is not recommended for their optimal health and well-being.

Can Guppies Live in Cold Water?

Guppies can live in cold water but prefer water between 75-80 degrees F. Anything lower than 70 degrees F will cause them to become stressed and lethargic, so it is important to maintain the right temperature range all year round. 

If you live in a tropical climate where the temperature is too cold, then it is best to keep your guppies in an aquarium with a heater. This will help ensure the water temperature remains within the preferred range and your guppies stay happy and healthy.

While guppies can survive in cold water temperatures, they cannot thrive in them. Providing them with a warm and stable environment for optimal health and well-being is important.

Follow these tips, and you can ensure that your guppies live a long, happy life. In terms of water changes, guppies should have at least 25-30% of their tank’s water changed once every two weeks or so.

What Temp Is Too Cold for Guppies?

It’s generally not a good idea to keep guppies in water colder than 60 degrees Fahrenheit (16 Celsius). Guppies are tropical fish and need warmer environments as they are sensitive to cool temperatures. Any temperature below 60 F can be fatal for them, so it is best to avoid it.

Additionally, temperatures above 80 F can harm guppies as they are not used to living in such warm water. The ideal temperature range for guppies is 72-82° F (22-28° C). Keeping the water within this range will keep your fish healthy and active.

So, to ensure your guppies stay healthy and happy, monitor the water temperature in their tank and install a heater if necessary.

This will help ensure the water remains within an optimal temperature range all year round and keep your beloved little guppies healthy.

What Is The Ideal Water Temp For Guppies Fish Tank?

Its best temperatures for guppies are 78 C to 84 C. Guppies need warmer water in aquariums. Despite its size, this species is adaptable to slight temperatures. This fish is fine if temperatures sometimes drop or rise beyond the recommended temperature range.

Moreover, guppies who live in extreme temperatures may feel stressed or sick. So, keep the temperature of the guppy fish tank between 78 to 84 degrees Fahrenheit. This range is ideal for keeping guppies healthy and active.

Benefits That a Guppy Tank with a Heater Has to Offer

A guppy tank with a heater will benefit your fish in many ways. It will keep the water temperature within an optimal range, which is necessary for guppies to stay healthy and active.

It will also provide your fish with a more stable environment as the temperature fluctuations due to changes in the outside weather will not affect it as much.

A properly heated tank also helps guppies breed more easily since they live in an environment closer to their natural habitat.

Finally, a heated tank will help prevent the growth of bacteria and other harmful organisms that thrive in colder water temperatures.

All in all, a guppy tank with a heater will provide your fish with optimal health and well-being as well as a comfortable environment. It is important to remember that guppies need warmer water temperatures to thrive, so investing in a heater is essential.

Guppy Aquarium Heater Size Guide

The aquarium’s size determines its heating capacity. Using small tanks, it is necessary to have a heater of lesser power density. Similar heaters need higher tank size heater wattage to provide sufficient water to be heated correctly.

A simple thumb rule must be followed when selecting a heating power. The rules are approximately 5 watt units per liter. Below is a list of heating wattages needed for saltwater aquariums. The room temperature was deemed 70 degrees Celsius (21 degrees Celsius).

The tank water can be heated according to the aquarium tank size and wattage described earlier.

Guppy Aquarium Heater Size Chart Examples:

  • 2-5 gallons = 25 watts
  • 10-15 gallons = 50 watts
  • 15-20 gallons = 75 watts
  • 20-40 gallons = 100 watts
  • 40-60 gallons = 150 watts
  • 60 or more = 200+ watts.

It is important to note that the heating power should always be calculated accordingly, as too much or little heat can lead to the death of the guppies. Thermometers are recommended to ensure that the ideal water temperature is maintained.

5 Types Of Aquarium Heaters For A Guppy Tank

Adding four kinds of aquarium filter heaters to an aquarium is possible. Not all heating systems can fit the setup of your tanks, though. Find a suitable heater for a guppy indoor aquarium here.

  • Glass Heaters: These are the most common types of filter heaters. They are simple and easy to use, making them great for beginners.
  • Submersible Heaters: They are made of plastic or titanium and must be placed inside the tank. This type of submersible heater provides more reliable and even heating.
  • Hanging Heaters: This type of tank water heater is usually made of titanium or stainless steel and is designed to hang from outside the tank. This type of heater allows for more precise temperature control with the help of a thermostat.
  • Automatic Heaters: Automatic heaters are the most advanced guppy aquarium water heater, allowing for more precise temperature control. Depending on the desired temperature, they can turn on and off automatically.
  • Substrate heaters: The substrate heater is made of ceramic or special plastics and is placed underneath the substrate. They provide a more uniform temperature distribution in the tank and can be adjusted to different temperatures. In summary, there are a variety of aquarium heaters that could be used for guppy tanks,

In conclusion, a guppy aquarium with a heater is essential to create a healthy and comfortable environment for your fish. Heaters come in all shapes and sizes, so ensure you get the right one for your tank. Measuring the water temperature regularly and adjusting the heater is important. Your guppies will have a safe and happy home with the right setup.

My Second Recommended Heater

I highly recommend the Fluval series heat pumps. They are not the most expensive available, but they were the same ones used by my previous aquarium and were excellent.

Fluval is an excellent brand—no worries about their breakage.

How Warm Should a Guppy Tank Be?

The optimum temperature for a guppy fish tank is between 74-82 degrees Fahrenheit. Providing the right temperature range is important, as guppies thrive in warm waters and can become stressed or even die if the environment gets too cold or hot.

Keeping the tank at a steady, consistent temperature is essential for keeping your guppies healthy and happy. It’s also important to ensure the temperature stays the same and that it is not too warm or cool for long periods.

What Happens If Guppies Stay in Warmer Water?

Guppies are dependent upon retaining stable water temperatures. Similar to cool water causing adverse consequences, warmer water can affect your fish.

Damage could occur if your tank contains an electric heater and the thermostat is too heated. Often Guppies swimmers haphazardly swim in too-hot water.

When you see the swim patterns of fish changing constantly, you must always test the thermostat on the water to ensure the thermostat is in good working order. Temperatures up to 30 degrees Celsius need immediate assistance.

What Temperature Should a Heater Be for Guppies?

What temperature do guppies need? The ideal temperature for a guppy tank is between 74-82 degrees Fahrenheit. Depending on the size of the tank, you may need to adjust your heater to get the temperature just right.

A thermometer is a great way to monitor the water temperature, and it’s important to make sure the heater is accurate and working properly.

It’s also important to note that for some fish, a wide range of temperatures may be suitable; however, guppies are sensitive to temperature changes and need consistent water heats.

What Happens When Guppies Are Exposed To Sudden Tank Water Temperature Changes?

Guppies are adapted to warm water. Nevertheless, it can be very sensitive to rapid changes in temperatures. The pup may be shocked if the room air temperature suddenly falls at some point. Body Temperature shock may cause death or commas, permanently irreparable damage to Their body.

In addition, rapid increases in water temperatures can result in respiratory difficulties. Warmer waters reduce oxygen levels, which means guppy fish need air for survival. The guppies might cry for air for several minutes before dying.

NOTE: Have a backup plan in case your aquarium tank’s heater stops working – make sure to store an extra spare heater just in case! A spare aquarium heater will ensure that your guppies always have a safe and comfortable environment.

How Should You Test The Tank Water Temp For Guppies?

Test water temperature can be performed either by hand or by thermometer. Put your fingers in water and check whether you have ice, heat, or lukewarm. A good water temperature should be lukewarm for Guppies.

Nevertheless, these measurements are not indicative. This is the reason you should buy your temperature meters. The thermometers are foolproof and precise. The instruments provide you with accurate readings of water temperature.

Can I Keep Fish Without a Heater?

Can guppies live without a heater? Yes, guppies can survive without a heater in the wild. However, a fish tank heater is essential for keeping your tank warm and at the right temperature.

Without a heater, the tank could become too cold or hot, which can cause stress and even death to your fish.

In conclusion, temperature is a key factor for guppy survival. It’s important to provide the right temperature range (74-82 degrees Fahrenheit) and keep the tank at a steady, consistent temperature.

Does Guppy Fry Need a Heater?

Does guppy fry need a heater? Yes, guppy fry needs a heater to stay healthy. Young guppies are most vulnerable to sudden changes in temperature, so having a constant water temperature is essential for their survival and development.

The ideal water temperature range for guppy fry is between 24-26°C (75-79°F), which can be achieved using an aquarium heater.

It’s important to note that this range should not be exceeded, as your guppies may become stressed and prone to disease-like fin rot when exposed to temperatures above 28°C (82°F).

What Fish Does Not Need a Heater?

Generally speaking, goldfish, common plecos, and tetras are a few fish that can do well in unheated aquariums. 

Goldfish can survive temperatures between 60-70 degrees Fahrenheit (15.5 – 21°C), while some varieties of common pleco have been reported to survive temperatures as low as 55 F (12.7 C).

Some tetra species are even more hardy and can survive unheated aquariums down to 50 F (10C). These fish will do best if the same temperature remains fairly consistent though sudden changes should be avoided to prevent stress on the fish.

What Do Guppies Like to Have in Their Tank?

What do Guppies need in their tank? Guppies are active, social fish, so they need plenty of things to entertain them. Provide your guppy plenty of places to hide and explore, such as rocks, driftwood, and live plants.

Guppies like to have a variety of surfaces to swim through, so provide them with decorations such as tubes and tunnels. Ensure your tank has plenty of space for them to play around in.

In addition, guppies need an adequate amount of oxygen to maintain good health. Add an air pump to your tank to provide sufficient oxygen levels for your guppies. Finally, keep the water clean and filtered to provide your guppy a healthy environment.

Does Guppy Need a Heater in Winter?

Yes, guppies need a heater in their tank to thrive in winter. Without a quality heater, the water temperature can drop significantly and cause stress on your fish.

While guppies are hardy fish that can adapt to colder temperatures, they won’t be able to survive long-term without an efficient heating device.

Invest in a high-quality water heater with adjustable temperature settings according to your tank’s needs to ensure the maximum health and vitality of your pet fish during winter.

Can I Keep Guppies Outdoors?

They should be kept in a tropical climate. No heat is required here since the sun acts the same way. There will be no need for heating at night because water cools faster, and the temperature will not hurt your fish.

Although it is possible to keep guppies outdoors, this should only be done in the warmest climates with temperatures between 75-82 degrees Fahrenheit.

You should also ensure the tank is covered and protected from predators, as guppies are easy prey for larger animals such as cats and birds.

In conclusion, a few key things to consider when keeping guppies in an outdoor tank. Ensure the area is warm, the tank is covered and protected from predators, and the temperature does not drop too low.

Keeping Guppies in Pond or Tub

Keeping Guppies in a pond or a tub is possible as long as both have plenty of clean water and the necessary filtration. When kept in an outdoor pond, they need additional aeration, like an air pump and filter, to keep the water from stagnating.

Tub systems must also be regularly cleaned and cycled to prevent dangerous toxins from building up. Additionally, guppies need access to shade and hiding spots, so ensure that your setup offers this regardless of the environment you choose for them.

Commonly Asked Questions About Do Guppies Need Heaters (FAQ)

Do Fancy Guppies Need a Heater?

Yes, fancy guppies do need a water heater, even in the warmer months. These fish are native to tropical waters and require temperatures between 75-82 degrees Fahrenheit to survive.

Do Juvenile Guppies Need a Heater?

Generally speaking, juvenile Guppy needs to heat the water for this reason. Young fish are more sensitive to changing water conditions and more susceptible when handled properly. For your baby Guppies to reach adulthood, they should keep their temperature at least 77 F (75 F).

Do Guppies Need an Air Pump?

Yes, guppies need an air pump to provide adequate oxygen levels in their tank. Without sufficient oxygen, your guppy will struggle to survive, making air pumps essential to all guppy tanks.

Do Guppy Fish Need a Filter?

Guppy fish need a filter to keep their tank clean and healthy. A good quality external canister or power filter is ideal for guppies as it will ensure the water is clean and clear. In addition, an effective filter will also help to maintain ideal water parameters for your fish.

Do Tetras Need a Heater?

Yes, tetras need a heater to remain healthy in the colder months. Without a heater, the water temperature can drop significantly and cause stress on your fish. Investing in a quality filter heater with adjustable temperature settings is best to ensure your tetras have the ideal environment to thrive.

Do Mollies Need a Heater?

Yes, mollies need heaters to survive in the colder months. Mollies are tropical fish that require temperatures between 75-82 degrees Fahrenheit to remain healthy.

Do Guppies Need Plants?

Guppies need plants in their tank to provide hiding places, shade, and a comfortable environment to swim around. Live plants are ideal as they also help to keep the water clean and of quality; artificial plants are also an excellent option for guppies as long as they are soft and don’t have sharp edges.


So, do guppies need a heater? Ultimately, it depends on the life you want for your guppies. In general, a filter heater is recommended for an optimal guppy experience. It ensures that the guppies are warm and comfortable in the aquarium and does not cost much to install or maintain. Heat provides essential temperature stability for happier, healthier fish which can lead to higher survival rates and a more vibrant aquarium.

Heaters also provide the perfect environment for them to breed if you want to experience the miracle of birth with your aquatic friends. Plus, a heated tank may deter some parasites that can harm large groups of fish, which makes them a smart choice for overcrowded tanks. All in all, if you’re considering whether guppies need a heater, the answer is yes! Sure, they need a heater!

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About Me

I am the founder of, a devoted wife and mother, and an avid fish enthusiast. My aim is to assist fellow fish lovers worldwide in understanding how to properly care for and breed their pet fish.

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