Best Molly Fish Temperature Range: Too Hot or Too Cold?

What temp do mollies like? Keeping your Molly fish happy and healthy starts with the right temperature in their tank. Creating an optimal environment is essential for maintaining a thriving fish habitat, so understanding the ideal Molly Fish Temperature is critical for successful pet ownership.

It can be hard to keep track of the ideal temp for mollies, and if the water is too hot or cold, they can get sick.

Knowing which molly temperature range works best for them can make or break a fish’s life expectancy within the home aquarium!

Temperature for molly fish

In this molly fish care guide, we’ll discuss how to measure, manage, and maintain the best temperature for molly fish at a safe level that won’t jeopardize your hardy fish’s well-being or quality of life.

Our guide includes tips on measuring the molly water temperature Celsius, what to do if it’s too hot or cold, and how to adjust your home’s thermostat so that your fish always have perfect water conditions.

Are Mollies Sensitive Fish?

Mollies are generally considered resilient fish but need the right environment to thrive.

If their tank is too hot or too cold, it can cause them stress and illness, so it’s essential to get the right molly fish water temp.

Ideal Molly Fish Temperature Range

What temperature do molly fish need? The molly ideal temperature ranges from 75-80°F. The Molly fish water temperature Celsius range (24-27°C) is crucial because it allows for the proper oxygen levels in the water and helps reduce stress on the fish.

Also, this mollies temperature range is a good balance between providing a comfortable environment for your fish and avoiding extreme mollie temperature that could cause health issues.

If the tank temp for mollies falls below 75°F (24°C), you should consider a heater to help keep your molly fish warm and healthy.

On the other hand, if it goes above 80°F (27°C), an aquarium chiller is recommended to bring the mollies temperature back down to an acceptable level.

Tips for Maintaining the Ideal Molly Fish Water Temp

  • Measure your molly fish water temperature regularly and adjust accordingly. You can purchase a thermometer at any pet store for this purpose.
  • Check the thermostat on your home’s heating/cooling system and adjust it if necessary.
  • Use an aquarium heater or chiller to keep the Dalmation Molly Temperature in a safe range.
  • Clean your tank regularly to avoid spikes in molly fish water temp due to the buildup of organic matter and other debris.
  • Keep your fish out of direct sunlight, which can cause their tank to become too hot quickly.
  • Place your aquarium in a room that is away from drafts, air vents, and other sources of extreme room temperature fluctuations.

Maintaining the ideal mollies water temp is essential for keeping your fish healthy and happy. By following the tips outlined above, you can ensure that your fish always have the best environment to live in.

What Temperature Is Too Cold for Molly Fish?

What temperature is too cold for mollies? Anything below 75°F (24°C) can be dangerous for mollies and even cause them to get sick.

If the mollies tank temperature drops significantly lower than this, consider investing in an aquarium heater or chiller to bring it back up into an acceptable range.

To keep your mollies healthy, aim to maintain temperatures between 68°F and 82°F. Avoid dramatic fluctuations which could prove damaging for them – however, they will survive the chill of the night!

What Temperature Can Mollies Live In? (Molly Fish Tank Temperature)

What temperature do mollies like? Mollies (or Poecilia sphenops) are tropical freshwater fish in various colors and shapes. They are native to Mexico, Central America, South America, and the Caribbean, so they thrive best when kept in warm water.

The ideal mollies fish temperature temperature is between 24-30°C (75-86°F). Anything below this molly temp range can cause them to become sluggish and will eventually lead to their death. 

Regularly monitoring the temperature of your freshwater tank

is vital for keeping Mollies healthy, as sudden changes can put them into shock if not correctly acclimated first.

Do mollies eat their babies

To help keep things on the safe side, you’ll want to make sure it never goes above 34°C (93°F) or falls below 22°C (71.6°F).

These temperatures should be particularly monitored during high heat or cold weather as they can quickly fluctuate without proper insulation or tanks with poor lids/covers. 

Another important factor that accompanies fish tank temperature is oxygen levels because the warmer it gets, the less oxygen will be dissolved in your aquarium water.

This can lead to stress on your fish, making them vulnerable to diseases like Ich and White Spot Syndrome, which are both deadly if left untreated. 

Can Mollies Survive in 86 Degrees?

Mollies can survive in temperatures up to 86°F (30°C). Anything higher than this is generally considered too hot for them and should be avoided.

For best results, mollies should have a consistent water temp for mollies between 75-86°F (24-30°C).

It’s also essential to monitor the oxygen levels in the tank as temperatures increase. Oxygen levels tend to decrease in warmer water, making it difficult for fish to breathe. Over time this can lead to health problems and even death if oxygen levels stay too low for too long.

Best Molly Fish Breeding Temperature

Are mollies cold water fish? For optimal conditions, mollies should be bred in warm waters of 25-27° C (78-82° F).

This mollies water temp will make them feel like they’re back home in their tropical environment. Heating the tank is a must, but filling it too full or with cold water can be lethal to your fishy friends.

In addition to the molly tank temperature, you should also maintain good water quality during breeding. Make sure to use a high-quality filter and perform regular water changes to keep fish healthy.

Also, ensure that your aquarium is correctly aerated with an air pump or bubbler for maximum oxygen levels.

Finally, feeding them a proper diet molly fish of live foods like brine shrimp, bloodworms, and daphnia will go a long way toward ensuring the health of your mollies.

By following these steps, you can ensure that your molly has all the conditions for successful breeding!

Best Temperature for Guppies and Mollies

What temperature do mollies like? Guppy fish temperature should be maintained between 72-82°F (22-28°C). For optimal growth and health, it’s essential to ensure that the mollies temperature does not drop below 68°F or rise above 82°F.

Guppies love their tropical home and, as such, require similarly warm water temperatures to thrive.

Guppy and molly temperature Celsius: A guppies breeding tank temperature between 72 – 82 degrees Fahrenheit (22 – 28 Celsius) will ensure your fishy friends are comfortable in a setting that replicates their natural habitat of the tropics.

What Type of Water Do Molly Fish Need?

Mollies have a great capacity for adaptation! Their ideal home is warm waters with neutral pH and hard water.

Surprisingly enough, they don’t need any salt added to the aquarium – these fish are pretty content living in freshwater their entire lives.

The ideal water temperature for mollies is between 75-86°F (24-30°C). Anything lower than this will make them sluggish and could eventually lead to their death.

Do molly fish need a heater? If you live in a colder climate, investing in an aquarium heater is crucial to keep the water at optimal water temp for mollies.

Molly Fish Tank Mates

Mollies are peaceful fish that enjoy the company of other tank mates. They can be kept together in tanks with plenty of hiding spots and open space for swimming.

Some suitable tank mates include small- to medium-sized peaceful fish such as tetras, platies, Corydoras catfish, Gouramis, dwarf freshwater shrimp, and livebearers such as guppies.

It’s best to avoid aggressive species, as they may bully or even attack your mollies. Other incompatible tank mates include large cichlids and other larger fish species.

When choosing tank mates for mollies, make sure that the water parameters and tank temperature match their requirements.

This will ensure that all the inhabitants of your aquarium can live happy and healthy life.

What Happens to Mollies in Cold Water

Can mollies live in cold water? In warm water, moles show signs of stress. It will be noticeable that the activity of the animals slowly slows down, so they die.

A poor water situation increases the potential for parasite and bacterial infections. Other critical processes influenced by unfavorable water characteristics include the ability of black molly fish to reproduce.

How many fish in a 10 gal tank

The reproductive system suffers from survival being the initial instinct, and all the organs that make up the life force are kept functioning.

Usually, the fish needs to be better conditioned in temperature. These creatures adapt quickly to a wild environment by settling on appropriate water parts.

Keeping Molly Fish Indoors

It is possible to keep mollies fish indoors in aquariums without heating in tropical regions with temperatures below 68-72 f.

How can we get warmer compared to tropical climates if the temperature drops? What are some of the best heating options for your home? I have no other option but to ask yes.

The room temperature is okay, but the water from the tank doesn’t have the temperature in the house’s air.

The water heats and warms slower than air, so an efficient heating device can help maintain the required water temp for molly fish.

Can Mollies Survive in Outdoor Ponds?

Okay. This can be done even in tropical climates. The temperature of the water does not drop below the optimal temperature range.

However, there may be unforeseen differences in climate. Molly lakes should be able to be used during summer.

Heating systems can also be challenging to achieve. Thus, we must relocate mollies into the garden to avoid a cold winter.

The snout is a significant advantage. The first advantage is that it gives you a wide range of mobility.

Then you get to add aesthetics to the backyard. It will be much safer and less stressful for them than consuming them indoors at all.

Keeping Molly Fish in Outdoor Ponds

I’m considering having some ponds that will keep fish from swimming outside. Tell me the right thing. If you have a tropical climate in which temperatures in winter stay above 68 degrees F, you can leave mollies in an outdoor pool or bath.

How does one live in a country where winters are not as hot as they should be? How can cold winter conditions affect our homes in the winter?

Can we put our molly fish out there before they can be found? Yes, certainly not. Not in winter. Keeping molly fish in an indoor pool during the summer is unnecessary.

How to Control Low Water Temperature for Molly Fish?

Alternatively, if you are concerned about a water drop below the recommended minimum water temperature of Mollie’s, you can try the following:

  • Utilize a reliable aquarium heater to ensure the molly water temperature stays above 75°F.
  • Consider using an insulated aquarium or tank hood to keep warm air inside the tank.
  • Make sure your home’s temperature doesn’t drop too low and keep it comfortable for humans.
  • Make sure the tank is in a place with good air circulation and away from any direct sunlight.

By following these simple instructions, you can be sure your Mollie will have the proper water temperature to stay healthy and happy.

Do Mollies Need a Heater?

Do molly fish need a heater? Mollies need a heater to maintain the desired temperature range of 70-77 degrees Fahrenheit.

The wattage you need will depend on the tank size of your aquarium, but a good rule of thumb is 5 watts per gallon.

Additionally, installing an aquarium thermostat will help monitor and maintain the molly water temp consistently.

Things to Consider Before Getting a Heater

The optimum heat source for your home is the power output. The dimensions of the aquarium determine the proper wattage for aquarium heaters.

There are easy methods to calculate how much wattage a gallon aquarium should use. One gallon equals 4 liters, and the power supply remains 5 watts.

You can also use thermostat-controlled heating systems to cool your home.

This will ensure that no temperature change affects water temperatures at an aquarium. Hence the mollies will stay healthy with their tank mates.

Can Mollies Survive in Saltwater?

Molly’s lives have brackish waters in which their salt levels exceed those found in freshwater. Can you list the benefits of using saltwater aquariums in your home?

Yeah. Mollies can survive on seawater. Generally, they work well in water and therefore do not require salt water in water.

When you do this, it is important to consult an experienced advisor about how to proceed. And stay in the water.

What Happens If The Water Temperature Is Higher Than Ideal Maximum Temperature In Molly Fish Tank?

Imagine if your room is freezing. How do people react efficiently? You might feel irritable. It’s even worse when you don’t act quickly.

Similar experiences can occur to Molly fish even with a high water level in their tanks.

You want something different! In cases where temperatures of the water exceed their maximum, the water becomes too warm.

Molly’s health was compromised. Eventually, he starts to stress, feels pain, and it gets a little dull.

What Is the Lowest Water Temperature Ideal for Mollies?

Mollies are freshwater fish from tropical climates and prefer water temperatures. Mollies prefer warm water between 75 degrees Fahrenheit. While mollies can adapt to temperatures below the recommended 70F but remain in their ideal range of water heat, it is vital to maintain their well-being.

Is An Aquarium Thermometer Essential While Using A Chiller?

It is necessary to use aquarium temperature sensors to keep the aquarium cool during operation. As previously mentioned, it will help detect fluctuations in temperature in water.

Besides this, it warns that mollies can be harmed. The aquarium thermometer is useless for thermoelectric chiller use, however.

These chillers include a thermostat function that lowers water temperatures. You can regulate molly water temp without the use of a thermometer.

Heater Size for Molly Aquarium – How to Calculate?

Aquariums are listed in Watts & Wattages. Your heater’s wattage may vary depending on your aquarium’s size.

The most commonly adopted method of measuring aquariums is calculating 5 Watts per gallon of water volume. So, when you have a fish tank with 25 pounds of water, you should have one heater of 115 watts.

If we follow this rule, we can warm water in our aquarium to meet the molly’s requirements, which will help.

Install an aquarium thermostat, which will keep the molly fish temp stable and not affected when it comes to water temperature. It is a highly recommended Eheim Jager aquarium heater.

Commonly Asked Questions about The Best Water Temperature For Mollies (FAQ)

Is 82 Degrees Too Hot for Mollies?

Yes, 82 degrees is too hot for mollies. The ideal mollies temperature range for mollies should be between 70-77 degrees Fahrenheit.

How Big Do Mollies Get?

Molly fish size can grow up to 4-5 inches in size. They are relatively large fish, and their size can vary depending on the type of molly.

Is 84 Degrees Too Hot for Mollies?

84 degrees Fahrenheit is too hot for mollies. The ideal molly fish water temperature range should be between 70-77 degrees Fahrenheit. Anything above this risks stressing the fish and potentially causing harm to its health.

What Ph Do Mollies Like?

Molly fish Ph level should be within the range of 6.5-8.5 Ph. The closer you keep it neutral, the better off your fish will be.

What Temperature Do Balloon Mollies Like?

Balloon molly fish temperature Celsius is usually between 21-25 degrees Fahrenheit or 70-77 degrees Celsius. They can sometimes tolerate higher temperatures if the balloon molly temperature Celsius are right.

How to Prevent Water Temperature from Getting Lower Than Ideal?

To prevent the water temperature from getting too low, it is essential to equip your aquarium with a heater and thermometer. Make sure you always keep the heater on and check the thermometer regularly to ensure the water is within the ideal mollies temperature range.

What Happens When Water Temperature Gets Lower Than Ideal?

When the water temperature gets too low, mollies become vulnerable to diseases and parasites. They may start showing signs of stress, such as lack of appetite, lethargy, and abnormal behavior.

What temperature should molly fish be in?

What is the best temp for mollies? Molly fish thrive in warmer water temperatures, between 72-82 degrees Fahrenheit (22-28 degrees Celsius). Maintaining this range is essential for their health and well-being.

Can mollies live in cold water?

Can molly fish survive in cold water? No, mollies cannot live in cold water. They are tropical fish and require warm temperatures, typically between 72-82 degrees Fahrenheit (22-28 degrees Celsius).

What is the optimal aquarium temperature for mollies?

What is the best temperature for mollies? The best aquarium temperature for mollies is between 72-82 degrees Fahrenheit (22-28 degrees Celsius). This range ensures their health and allows them to thrive.

What temperature water do mollies need?

What temperature should mollies be kept at? Ideal molly water temperature is 72-78 degrees Fahrenheit (24-27 degrees Celsius). They tolerate a wider range, but this keeps them happy and healthy.

What is black molly fish water temperature?

What temp should mollies be kept at? Black mollies thrive in warm water between 72-78 degrees Fahrenheit (22-26 degrees Celsius). Aim for a stable temperature within this range for optimal health.

Can molly fish live in cold water?

Molly fish are tropical and prefer warm water. They thrive between 72-82°F (22-28°C). Molly fish cold water will stress them, weaken their immune system, and lead to illness or death.


So, what temperature do mollies need? Maintaining a stable water temperature in your aquarium is critical to the health and happiness of your molly fish. The ideal Molly fish temperature is between 74 and 79 degrees Fahrenheit. Mollies are tropical fish, so they need warm water to survive. Keeping your Molly tank at the right temperature will help your hardy fish live a long and healthy life. By following the temperature for molly fish guidelines we’ve outlined above, you can ensure that your molly fish will thrive in their environment. Do you have any other tips for keeping molly fish healthy and happy? Fish keepers, Share them with us in the comments below!

You might also like

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.

Recent Posts

Stay Updated

Get outdoor trends, data, new products, and tips delivered to your inbox.

error: Content is protected !!
Scroll to Top