Molly Fry Care: Expert Guide & Tank Set Up for Beginners

How to take care of molly fry? Are you looking to keep Molly Fry in your home aquarium but need help knowing where to start? The correct tank setup and care routine are essential for happy, healthy fish.

When it comes to fish, there’s a lot of information that could be clearer and more manageable for beginners.

Many people are hesitant to get into fishkeeping because they need to figure out where to start or are worried about making a mistake that will endanger the lives of their new pets.

In this blog post, we’ll walk you through everything you need to know about caring for Molly Fry – from setting up their ideal community tank environment maintaining warm water parameters, and providing proper nutrition.

molly frys

This guide has all the information beginners need to keep molly frys successfully!

How Often Molly Fish Give Birth?

Pregnant molly fish can give birth to live young every 30 days, depending on the species. Depending on the number of fries (baby mollies) born, reproduction habits can vary greatly.

Generally speaking, it may take 5-10 weeks for any species of molly fish to reach sexual maturity and produce a brood of fry.

Molly Fries Tank Set Up:

Molly fry needs a specialized tank set up that allows them plenty of space and oxygen. The appropriate size of the tank will depend on their size, but a good rule of thumb is 10 gallons per inch of fish.

When setting up a 20 gallons tank for Molly Fry’s, use a soft and easy substrate on their delicate bodies. Fine sand or gravel works best.

Adding plenty of live plants to the community tank will provide cover and oxygen for this tropical fish. The more you add plants, the better.

Molly fry also needs a filter to keep the water clean and healthy. A sponge or hang-on-back (HOB) filter will do the job nicely.

Do Mollies Eat Their Fry?

Will mollies eat their own fry? Yes, adult mollies often eat their fry. This is because they will consume any small food items in the environment when given the opportunity.

In addition, it is thought that adult molly fish may consume fry as a form of population control; if there is more fry than can be supported by the environment, adults will eat them to prevent over molly fish population.

Therefore, it is essential to provide plenty of hiding places for newly-hatched fry and ensure adequate diet and living space for mollies breeding to limit the predation of fry by adults.

How Big Are Molly Fish Fry at Birth?

When it comes to fish fry growth, many myths and misconceptions are floating around. 

It can take time to determine what’s true and what’s not when it comes to fish fry growth. Do you know how big molly fish fry should be at birth? How often should you feed them? What kind of food should you give them?

This video dispels some of the most common myths about fish fry growth and offers practical tips to help your molly fry safe.

How Mollies Are Born?

Mollies spawn from completely formed fry without eggs and can swim in just two hours. Molly males begin reproductive at 12 months – women reach reproductive age in 6 months.

Mollies carry eggs from their mate for 30-45 day periods. The breeding process does not have a specific premise; keep male and female mollies in an aquarium. Breeding occurs without intervention.

Female mollies have larger abdomens and start seeking shelter in darker areas of aquariums as they prepare to give birth to their babies.

What Does Newborn Molly Fry Look Like?

What do molly fry look like? Newborn Molly Fry is a fantastic sight to behold! They have a dark brown color with darker stripes running down their bodies.

Molly balloon fish

Their eyes can be bright yellow or orange, and they have silvery barbels near their mouths, which help them pick up food particles from the water.

Their fins are usually transparent and may even appear white in some cases. They also have small scales around their body that add to their charismatic look.

When Do Molly Fry Get Their Color?

Molly fry gets its color during its first month. During this time, the fry will transition from a silvery-blue hue to more vibrant colors like yellow, orange, and blue as they mature.

To encourage the color development of your fry, it is crucial to provide them with a varied diet containing plenty of live foods, flake food, and vegetables.

A good balance between protein and carbohydrates helps the fish develop strong fins, scales, and vivid coloring.

Lighting also plays a vital role in helping young fish maintain healthy fins while allowing them to display beautiful hues of blues and yellows.

What Color Will My Molly Fry Be?

Molly fries are colored as desired. They usually match the parents’ colors. French fries are grey and will change color when they get older. You’ll find that your community tank was filled with Mollies before you could see it.

Mollies have a variety of colors, from red, yellow and green to blue and even black. The genetics of Mollies will depend on the color of the parents.

With that said, there is no guarantee what color your Mollies will be when they grow up. It’s a fun surprise that you can look forward to finding out about!

Keep in mind the environment and diet of your Molly fish fry will also affect their coloring. So, if you want vibrant and healthy-looking Mollies fry, provide them with the best care possible.

Molly Fry Vs. Guppy Fry

Molly and guppy fry look very similar at birth. However, there are distinct differences between the two species.

Guppies are more miniature than mollies, which can grow up to 3 inches in length, while guppies reach a maximum size of 1.5 inches.

Guppy fry also has more colorful bodies than mollies, with hues ranging from bright yellow and orange to dark grey and black.

Molly fry is larger than guppy fry and can live up to 5 years, while guppies have a lifespan of 2-3 years. Mollies also require more food than guppy fry as they grow, so you’ll need to feed them more frequently.

How Many Fry Do Mollies Have?

How many fry can a molly have? On average, mollies have between 40 and 100 fry. The exact number of fry will depend on the species, size, age, and health of the female molly fish.

It’s important to note that some female mollies can produce up to 300 or more live young in a single spawn!

Molly Fry Survival Rate:

The survival rate of molly fry depends on many factors. This includes the amount of food available, the water quality, and potential predators in the tank.

On average, only about 10% of the fry will survive to adulthood in captivity due to predators and competition for resources. This number can be much higher in a wild environment, up to 50%.

It is crucial to provide them with a safe, stable environment and plenty of food. To improve the chances of survival for your molly fry

What fish will eat Molly Fry?

It is important to be aware of any potential predators that may be present in your tank when raising molly fry.

Unfortunately, many fish will happily feast on unsuspecting molly fry. Common predators include other fish such as angelfish, cichlids, barbs, and even some species of shrimp.

Additionally, snails and other invertebrates can also be a threat to fry. Keeping molly fry in a separate tank from other fish is best. To ensure their safety, 

Methods To Protect Molly Fry In The Main Tank

As I said, Molly fry may be vulnerable to others other than her parents. This will help your children grow into an adult, healthy molly.

It is possible to select a method of protecting or caring for Molly fry. The save molly fry method is:

Introducing Molly Fry In The Nursery Tank

Once you have all the necessary elements in the Nursery Tank, introduce molly fry to the same tank with caution. Bringing them into the tanks is a straightforward job, but entering new places can be confusing and sometimes frustrating.

Between them, it can cause stress. Also, the Molly Fry containing bag or breeding box must stay at room temperature to avoid such disturbances.

This gradually increases the temperature of a container to equal the tank water temperature. After fifteen minutes, slowly release Molly Fry for a moment. Then, check whether they are adapting correctly.

Create a suitable environment for the fries.

To isolate mother molly, you must provide an optimal environment to grow fries. How does fry growth occur? We’ll talk more about that soon.

Please help us keep up with us! You can also use live aquarium plants in the nursery tank to provide the fry with shelter and hiding places. You can even choose non-toxic artificial plants, perlite, or coconut fiber to make the tank more natural.

What to Do When Molly Fish Has Babies? (Molly Fry Care)

How to take care of molly fry? Molly Fry Care is a channel that provides information on how to take care of molly fish when they have babies. 

It can be challenging to know how to care for fry when they are born, and many people lose them because they don’t know what to do.

Molly Fry Care is here to help. In this video, we will show you step-by-step what you need to do to ensure that your fry survives and thrive.

Do Molly Fry Need a Filter?

Filtration is essential to ensure your Molly fry stays safe, so outfit the tank with a foam filter or other suitable system for its size.

If you don’t want a traditional option like this, shop around the local aquarium store in search of an attachment that will guarantee the safety of your young fish. It’s essential to consider the size of the tank and filter, as well as its flow rate.

Once you’ve chosen an appropriate filter for your freshwater tank, clean it and replace the media regularly for optimal performance.

Do Molly Fry Need Air Pump?

Does molly fry need an air pump? Yes. Molly fry requires air pumps. It’s essential to use water to allow for gas exchange.

It will ensure that they can maintain the correct oxygen needed for survival. You only have to make sure the air filter is installed correctly.

This is even more important if you keep the fry in a separate breeding tank. An air pump will ensure that your fry can get the oxygen they need.

What to Feed Molly Fry?

What do you feed molly fish fry? 1-day-old molly fry will feed on the eggs they were born with, known as yolk sacs. These will provide nutrition for the first few days of their lives.

Once the yolk sac is gone, you can feed them baby brine shrimp or crushed flakes. Live foods such as microworms, baby brine shrimp, and daphnia are best for fry. If you cannot provide these live foods, buy high-quality fish flakes.

It’s essential to ensure the food is small enough for them to swallow and that you feed in several smaller portions rather than one large meal. This will ensure that all the fry get a chance to eat.

What Temperature Should Molly Fry Tank Be?

The temperature of the molly fries tank should be between 72 and 82 degrees Fahrenheit (23-27°C). The tank’s temperature affects the fry’s metabolism and growth rate. It is a measure of how quickly the fry is growing.

To ensure that your fry has an optimal environment, it is essential to use an aquarium thermometer. This will help you monitor the temperature and ensure it does not get too hot or too cold.

It is also essential to adjust the temperature slowly over time to prevent any stress on the fry. To do this, you can use an aquarium chiller or aquarium heater to adjust the temperature.

What Is the Best Food for Molly Fry?

The best food for Molly Fry is baby brine shrimps. The small size and high protein content make it an ideal food for these tiny fish.

For those unable to feed their fry live foods, a high-quality flake food can be ground into a fine powder so that the dalmatian molly fry can easily consume it.

Be sure to select a formula specifically designed for young fish with plenty of nutrients like vitamins and minerals and complete proteins from multiple sources such as egg, plankton, spirulina algae, and more.

How to Feed Molly Fry?

To feed Molly Fry, you should offer small amounts of food several times a day. Aim for about a pinch at a time and provide as much as they can consume within two minutes.

Avoid overfeeding to prevent unnecessary waste, clogged filters, and other issues associated with an overly-stocked aquarium.

If you’re using commercial flake or pellet foods, make sure to use products designed explicitly for fry and decrease the size of the food accordingly.

Choose live food such as newly hatched brine shrimp or micro worms for a more natural diet.

How Many Times A Day Can I Feed Molly Fry?

How Often to Feed Molly Fry? The Molly fry’s digesting cycles also last a short time. Because of this, they should prepare another lunch soon. You can feed them five times daily. Even though the children usually start eating, don’t overfeed them.

Molly fries should be fed several times daily with small meals they can easily consume without leaving leftovers in the aquarium.

Fry food should be high in protein to help them grow quickly and maintain strong fins and scales. We recommend feeding your fry three times a day with quality Molly Fry Food to ensure they get the nutrients they need.

Feeding your fry live foods like vinegar eels and bloodworms can also be beneficial, as well as frozen or freeze-dried versions of these foods.

1 Week Molly Fish Fry Growth Chart

Molly Fry is an excellent fish for your aquarium, but you need to know how to take care for molly fry if you want them to grow and thrive. 

A healthy Molly fry can grow up to 3 inches in length in just one week! If you need clarification on what the growth stages look like or how to care for your fry, then you need this guide.

This growth chart includes pictures of each stage so you can quickly identify the different stages of fry development. You’ll also find food, water temperature, and tank size tips.

How Do You Make Baby Molly Fry Grow Faster?

Mollies will grow in four months, but there aren’t any guarantees. The mollies are slow in growth due to several reasons, including the lack of water change or poor diet.

Then you must follow these steps to increase the baby fish growth rate:

1. Provide them with protein-rich food: Protein is the key to Molly fry’s growth and development, so ensure that you give them food with high-protein content.

2. Include vegetables and fruits in their diet: Vegetables and fruits provide essential vitamins that help in molly fry growth.

3. Increase the water temperature: Warmer water helps to speed up the metabolism and thus increases the growth rate.

4. Do regular water changes: This will help to remove the toxins from the water, which can stunt the growth of baby molly fish.

5. Reduce stress: Provide a peaceful environment with plenty of swimming space and hiding places for the molly fry to reduce their stress level, which will help them grow faster.

By following these steps, you can ensure that your baby molly fish reaches their full size as quickly as possible.

When to Release Molly Fry to Main Tank?

When your molly fry reaches the size of 1 inch or more, it can be released into the main tank. It is vital to ensure the water parameters of the main and fry tank match before releasing them, as sudden changes in water chemistry can stress them out.

If you wait too long to release molly babies into the main tank, they may become stunted or even die. The general rule of thumb is to remove them when they are 1-2 months old.

Before releasing the fry, quarantine them for at least two weeks to ensure they are free from pathogens and parasites.

Molly Fry Tank Maintenance

Unless your Mollusks remain in the identical aquarium as the other fish, the tank’s parameters should remain constant. In contrast, the change to mollusks is regular as molly fish can handle higher levels of toxins than fish.

If you choose to install nursery water tanks to keep the fry, here are your goals:

  • Test the water regularly to be sure that nitrates, ammonia, and pH are within acceptable ranges.
  • Change 1/4 of the water every week to keep the tank clean.
  • Feed the small fry amounts at least twice a day.
  • Clean out leftover, and uneaten food after your feeding routine is finished.
  • Make sure the fry has plenty of hiding places, decorations, and caves to hide in.
  • Keep the temperature of the water between 75-80 degrees Fahrenheit (23-26 C).
  • Provide appropriate live foods like brine shrimps, bloodworms, and frozen or freeze-dried versions.
  • Make sure the baby molly fish has enough hiding places.
  • Keep a close watch on the fry to ensure they are healthy and growing properly.
  • Monitor the ammonia and nitrite levels in the fish tank, as high levels can be fatal to baby molly fish.

By following these steps, you can ensure that your molly fry is healthy and grow to its full size in the shortest amount of time.

Preventing Molly Fry from Fish Disease

Since fry mollies are very small to detect and combat a salmonella infection, it is better to prevent it.

When you’re unaware, the air is composed of several microorganisms, which can cause molly fry damage when heated.

In pond water, there is an abundance of bacteria and fungi that increase the risk of fish infections. Consequently, conditions such as those may impact molly fry in extreme cases.

This way, you will avoid molly fry from fish infection. How should you get this done?

• Keep the tank clean: A dirty aquarium with organic waste can be more vulnerable to harmful bacteria and parasites that may infect molly fry.

• Test the water regularly: Regularly check and ensure that your tank’s water parameters are within acceptable ranges.

• Introduce healthy fish: Ensure introducing only beneficial and properly quarantined fish into your tank.

• Treat water with aquarium salt: Adding aquarium salt to the tank can help prevent disease and infections.

• Provide nutritious food: Feed your molly fry a balanced diet that contains all the necessary nutrients to help them grow.

• Observe fish behavior: Watch your molly fry closely; if you notice any changes in their behavior, take action immediately.

By taking the necessary steps and precautions, you can ensure that your molly fry stays healthy and reach its full potential.

Caring for molly fry can be a rewarding experience as they are resilient and often easy to raise. Your molly fry will grow into a healthy and vibrant adult fish with proper care and attention. Good luck!


Although Molly Fry care may seem daunting, setting up a tank and providing the necessary care for molly fry is relatively easy. By following our expert tips and ensuring that you have all of the essential supplies, you can be sure that your baby molly fish will thrive. You’ll be an expert in Molly fish Fry care in no time at all!

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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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