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Molly Fish Care Guide – How to Take Care of a Molly Fish

Molly Fish Tank Setup

Choosing the Right Size Tank for Your Mollies

When it comes to molly tank size, a reasonable rule of thumb is to provide at least 10 gallons of water per fish. So, if you’re going to keep three mollies, you’ll need a tank that holds at least 30 gallons of water.

Naturally, the more room your mollies have to swim in, the better. Therefore, it is recommended that you go with a larger tank if you have the space (and the budget).

For a group of mollies, a 40-gallon or even a 50-gallon tank would be ideal. However, the larger the better, as they enjoy swimming in open water.

Selecting the Best Filter for Your Molly Fish Tank

Another important consideration when setting up a molly fish tank is choosing the right filter. It will help to keep your water clean and clear, and it will also provide a place for beneficial bacteria to live. These bacteria help to break down fish waste and other organic matter in the tank, keeping the water quality high.

When choosing a filter for your molly fish tank, we recommend going with an external canister filter. This system is very effective at filtering out debris and waste from the water, and it’s not too difficult to maintain.

Just be sure to choose a filter that’s rated for a tank size that’s similar to the one you have.

Setting Up Your Tank

Now that you’ve got all of the necessary supplies, it’s time to set up your molly fish tank.

  1. Start by placing the tank in a location that’s out of direct sunlight and away from any drafts. Then, add enough dechlorinated water to the tank to fill it up to the desired level.
  2. Next, it’s time to add your substrate. Mollies do best in tanks with sandy substrates, so we recommend using quality aquarium sand. You can also use gravel, but be sure to avoid anything too large or sharp, as it could injure your fish.
  3. Then, you can start adding some decorations to the tank. Mollies prefer tanks with plenty of hiding places, so be sure to add some rocks, driftwood, or live plants to the tank. Just be sure not to overcrowd the tank, as this can stress out your fish.
  4. Now it’s time to add your filter. Follow the instructions that came with your filter to set it up properly. Once the filter is in place, you can add your heater and thermostat.
  5. The final step is to add your mollies to the tank. We recommend acclimating them slowly by adding a little bit of water from their original tank (or container) to the new tank every few minutes. This will help them get used to the new water temperature and chemistry.
  6. Once your mollies are in the tank, you can start adding some plants or other decorations if you’d like. Just be sure not to add too much at once, as this can overwhelm your fish.

Water Requirements for Molly Fish

lighting for molly fish

Molly fish are a type of freshwater fish that are popular in home aquariums. They are relatively easy to care for and can live in a variety of water conditions. However, there are some basic water requirements that all molly fish need to thrive.


Molly fish are relatively tolerant of different water conditions, but they prefer slightly alkaline water. The ideal pH level for molly fish is between 7.5 and 8.5. Water that is too acidic or too alkaline can cause health problems for molly fish.


Molly fish come from tropical climates and prefer warm water. The ideal water temperature for molly fish is between 75-82 degrees Fahrenheit. If the water temperature drops below 75 degrees, the molly fish may become sluggish and stop eating. In extreme cases, low water temperatures can lead to death.


Molly fish prefer soft to medium hardness water, between 15 and 30 dGH. Hard water can cause health problems for molly fish, including gill damage and respiratory infections.

Ammonia and Nitrites

Molly fish are very sensitive to ammonia and nitrites. Ammonia is produced by the breakdown of organic matter in the aquarium, and nitrites are produced by the breakdown of ammonia. Both of these substances are toxic to fish, and even low levels can cause stress and illness.

For this reason, it is important to maintain high water quality in a molly aquarium.

Plants for Molly Fish

Aquarium plants are important for molly fish tanks for a few reasons. Indeed, plants help to create a natural environment for the fish and can also provide them with hiding places and shelter.

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Aquarium plants also help to oxygenate the water and remove harmful toxins.

Some good plant choices for Molly fish aquariums include:

  • Java Fern (Microsorum pteropus)
  • Anubias (Anubias barteri)
  • Hornwort (Ceratophyllum demersum)
  • Water Sprite (Ceratopteris thalictroides)
  • Vallisneria (Vallisneria spiralis)

When selecting plants for your Molly fish aquarium, be sure to choose ones that are suitable for the size and number of fish you have. You will also want to consider the water conditions in your aquarium, such as pH level and temperature.

It is important to avoid those that have sharp edges or are poisonous to fish. Some common plants that should be avoided include lilies, daffodils, and tulips.

Lighting for Molly Fish

Molly fish can adapt to a wide range of lighting conditions; they prefer dimmer lighting. This is because molly fish come from murky waters where there is not a lot of light penetration, so it is important to not use too bright of a light bulb in their tank.

A good rule of thumb is to use a light bulb that is no more than 30 watts for a 10-gallon tank and no more than 50 watts for a 20-gallon tank.

It is also important to provide some areas of darkness in the tank for the molly fish to hide if they feel like they need to. This can be accomplished by using floating plants, or by placing rocks or other decorations in a way that creates shady spots.

Molly fish are not particularly sensitive to light changes, but it is still a good idea to try and keep the lighting as stable as possible. This means avoiding sudden changes in light intensity, such as turning the lights on and off frequently or using a very bright light. If you need to make a change to the lighting, do it gradually over a few days.

There are a few things to consider when choosing the right light for your molly fish tank.

  • First, you need to determine the intensity of the light. Molly fish do best in low to moderate light, so you should choose a light that is not too bright.
  • Second, you need to consider the color of the light. Molly fish prefer dimmer, blue-toned lighting, so it is best to avoid lights that are too white or green.
  • Finally, you need to make sure that the light you choose does not produce too much heat. In general, molly fish do not like high temperatures, so a light that emits a lot of heat may stress them out.

How to introduce Molly Fish to a new tank

how to feed a molly fish

When adding Molly Fish to a new tank, it’s important to take care of a few things first. Make sure the tank is properly cycled and the water parameters are within the ideal range for Molly Fish.
It’s also important to acclimate the fish slowly to the new tank water.

  1. To do this, float the sealed bag of fish in the tank for about 15 minutes.
  2. Then, open the bag and let some of the new tank water inside.
  3. Close the bag and let it float for another 15 minutes.
  4. Repeat this process until the bag is full of new tank water.
  5. Finally, release the Molly Fish into the tank
  6. Monitor the fish closely for the next few days and look for any signs of stress or illness.

Molly Fish are relatively hardy fish, but they can still be sensitive to changes in water quality. If everything goes well, your Molly Fish will soon be acclimated to their new home and will start exploring their new tank!

It’s also important to introduce them to the new tank mates gradually. If possible, start by adding just one or two other fish at first.

Allow them time to get used to each other before adding any more. This will help reduce the stress levels for all of the fish involved and make it less likely that there will be any aggression or territorial issues.

How to transfer Molly Fish

There are a few different ways to transfer Molly Fish, and the method you choose will depend on your fish’s size, the distance you’re moving them, and whether or not you have another tank set up and ready to go.

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One of the simplest methods is to use a small cup or bowl to scoop up your fish and then gently place them in their new home. If you’re moving your fish a short distance, this can be an easy way to get them there without too much stress.

Another option is to use a plastic baggie filled with water from your Molly Fish’s tank. Make sure the bag is securely sealed, then float it in the new tank for about 15 minutes so that the temperatures can equalize. After 15 minutes, you can release your fish into their new home.

If you’re moving your Molly Fish a long distance, you may need to use an oxygenated shipping bag. These bags are available at most pet stores, and they’ll help to keep your fish alive and healthy during transit.

Whatever method you choose, be sure to acclimate your fish slowly to their new environment. sudden changes in temperature or pH levels can be stressful or even deadly for fish, so it’s important to take things slowly.

With a little careful planning, transferring your Molly Fish to their new home can be a stress-free experience for everyone involved!

What does Molly Fish eat?

Molly fish are omnivores, which means that they will eat both plants and animals. In the wild, molly fish typically eat algae, small crustaceans, and insects. When kept as pets, molly fish can be fed a variety of foods, including pellets, flakes, live food, and frozen food.

While Molly fish will eat just about anything you give them, it is important to provide them with a diet that is high in protein and low in fat.

  • A good quality flake food or pellet food should be the foundation of their diet, and they will also appreciate being given live or frozen foods such as brine shrimp, bloodworms, and daphnia regularly.
  • In addition, you should also supplement their diet with plenty of fresh vegetables such as zucchini, broccoli, and spinach. By providing your Molly fish with a well-rounded diet, you will help to ensure their overall health and well-being.

How to Feed a Molly Fish

plants for molly fish

One important thing to remember when feeding your molly fish is that they are not very efficient at digesting plant matter. As a result, it is important to offer them a diet that is high in protein. You can offer them two parts animal-based foods to every one part plant-based food.

When offering live or frozen foods, it is important to remember that these foods can sometimes carry harmful bacteria. To reduce the risk of this, be sure to purchase live and frozen foods from a reputable source and always rinse them thoroughly before feeding them to your fish.

Another thing to keep in mind when feeding your molly fish is that they tend to overeat. When feeding molly fish, it is important to remember that they are small fish. As a result, they should be fed small amounts of food several times a day. Overfeeding can lead to health problems such as obesity and swim bladder disease.

In general, molly fish should be fed two or three times per day. If you are offering them live or frozen foods, you may need to feed them more often. When feeding pellets or flakes, you can simply sprinkle the food on the surface of the water and allow your fish to eat at their leisure.

How often should you clean Molly Fishtank

Most experts recommend cleaning a Molly fish tank at least once every two weeks. This will help to remove any waste or debris that has accumulated in the tank.

It’s also important to do a partial water change during each cleaning, as this will help to keep the water quality high. If you have a lot of plants in your tank, you may need to clean it more often to prevent the build-up of algae.

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Cleaning a Molly fish tank is relatively simple and only takes a few minutes.

  1. First, you’ll need to remove all of the fish from the tank and place them in a temporary home, such as a bucket or bowl.
  2. Next, use a gravel vacuum to clean the substrate and remove any debris.
  3. Then, do a partial water change of about 25%.
  4. When changing the water, it is important to use clean, fresh water that has been treated with a de-chlorinator. You can either use a siphon to remove the dirty water or you can carefully pour it out into a bucket. Be sure to replace the water that you remove with clean water.
  5. Finally, wipe down the inside of the tank with a clean cloth to remove any algae or build-up.

Common Molly Fish Diseases

breed molly fish

Some of the most common diseases that affect molly fish include:

White Spot Disease

Also known as Ich or Cryptocaryon irritans, white spot disease is caused by a parasitic protozoan. It is one of the most common diseases in aquarium fish and can be fatal if left untreated.

Symptoms include white spots on the body and fins, scratching against objects in the tank, and loss of appetite.

Velvet Disease

Also known as Aufwuchs or Oodinium ocellatum, velvet disease is caused by a parasitic dinoflagellate. It is a relatively common disease in aquarium fish and can be fatal if left untreated.

Symptoms include a velvety or fuzzy appearance on the body and fins, loss of appetite, and lethargy.

Hole in the Head Disease

Also known as Hexamita or Spironucleus vortens, a hole in the head disease is caused by a parasitic protozoan. It is a relatively common disease in aquarium fish and can be fatal if left untreated.

Symptoms include holes or pits in the head, loss of appetite, and lethargy.


Finrot is caused by bacteria and is one of the most common diseases in aquarium fish. It is often the result of poor water quality or injuries sustained from fighting or scraping against objects in the tank.

Symptoms include fraying or rotting of the fins, redness or inflammation, and lethargy.


Also known as ascites, dropsy is a symptom rather than a disease. It is usually caused by bacteria, but can also be the result of a viral infection or a tumor.

Symptoms include bloatedness, scale protrusion, and lethargy.

How do you breed Molly Fish

Mollies are a type of fish that can be found in many different freshwater ecosystems. They are a popular choice for aquariums and home aquaria because of their vibrant colors and active personalities.

Mollies are easy to care for, and they are tolerant of a wide range of water conditions.

Mollies are livebearers, which means that they give birth to live young rather than laying eggs. When it comes time to breed molly fish, there are a few things you will need to do to ensure successful spawning.

The first thing you will need to do is set up a breeding tank. This tank should be at least 20 gallons in size, and it should have plenty of hiding places and vegetation. The water in the breeding tank should be clean and well-aerated. You will also need to add a sponge filter to the tank.

Once the breeding tank is set up, you will need to choose a pair of mollies that you want to breed. It is best to choose a male and female that are similar in size and coloration. The male molly should have long, flowing fins, and the female molly should be plump with a gravid spot.

When you have chosen your breeding pair, you will need to acclimate them to the new tank. To do this, simply float the sealed bag that they came in on top of the tank for about an hour. This will allow the fish to adjust to the new temperature and water chemistry.

After the fish have acclimated, you can release them into the tank. The mollies will usually start spawning within a few days. The female molly will release her eggs as the male fertilizes them. The eggs will sink to the bottom of the tank and hatch within 24-48 hours.

The fry will hide among the plants and décor in the tank until they are large enough to fend for themselves. At this point, you can remove the adults from the tank and raise the fry on their own.
Molly fish are relatively easy to breed, and they make great additions to any freshwater aquarium. With a little bit of preparation, you can have your own molly fry in no time.

How do Molly Fish mate?

The mating season for molly fish can vary depending on the species but generally takes place during the spring and summer months. During this time, the males will become more aggressive as they compete for mates. If you have multiple molly fish in the same tank, you may notice some fighting during this time.

Molly fish mate by releasing their eggs into the water, where they will be fertilized by the male’s sperm. The eggs will then hatch into fry or baby fish. Fry can be difficult to care for, so it is important to research how to best care for them before attempting to breed molly fish.


Mollies are a great addition to any freshwater aquarium. They are peaceful, relatively easy to care for and make a beautiful addition to your home. With the proper care, molly fish can live 5-7 years in captivity.

Make sure you have the proper tank size and setup and that you are prepared to provide the appropriate care. Mollies are hardy fish, but they still require some specific conditions to thrive.

With the right care, your molly fish will be a happy and healthy addition to your family for many years to come. Thanks for reading!

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