Can Guppies Live with Mollies Peacefully: (Expert Advice)

Can guppies live with mollies? Guppies and mollies are popular for beginner aquarium enthusiasts due to their vibrant colors and ease of care. Many aquarium owners often wonder whether these two species can coexist harmoniously in the same tank.

Both guppies and mollies are peaceful fish, making them potentially compatible tank mates.

However, there are specific factors to consider when determining whether guppies can live with mollies, such as tank size, water parameters, and the male-to-female ratio of each species. 

How many guppies should be together

This article will delve into the intricacies of keeping guppies and mollies together in an aquarium setting. We will explore their compatibility regarding temperament, diet, and breeding behavior.

Additionally, we will discuss the ideal tank conditions for housing both guppies and mollies and provide tips for maintaining a healthy and thriving aquatic environment.

By the end of this article, you will understand whether guppies and mollies can peacefully cohabitate and how to ensure their well-being in a shared tank. 

What Are Guppies and Mollies?

Guppies and mollies are small freshwater fish popular among aquarium enthusiasts. Guppies, also known as millionfish, are known for their vibrant colors and unique patterns. They are relatively easy to care for and are an excellent choice for beginner fish owners.

On the other hand, mollies are known for their peaceful nature and ability to live in both freshwater and brackish water environments. They come in various colors and can be a great choice for a community tank.

Both guppies and mollies are livebearers, meaning they give birth to live young rather than laying eggs. They are also known for their breeding capabilities, with female fish often giving birth to dozens of fry at once. These fish are generally compatible with each other and can make for a visually stunning and lively addition to any aquarium.

A Quick Overview of Mollies And Guppies Compatibility

Can mollies live with guppies? Mollies and guppies are popular freshwater fish often kept in community tanks. Due to their similar preferences in water parameters and peaceful nature, they are generally compatible and can be housed together without much trouble.

Both mollies and guppies are livebearers and can readily interbreed, producing hybrid offspring known as “muppies.” However, it is essential to note that mollies tend to be slightly larger and more aggressive than guppies, so ensuring enough space and hiding spots in the tank to prevent territorial disputes is vital.

Additionally, feeding can be a concern, as mollies have a slightly different diet compared to guppies. Providing a varied diet that caters to the specific needs of each species is essential for their overall health and well-being.

With proper care and attention to their requirements, mollies and guppies can coexist peacefully and offer a visually appealing and dynamic community tank.

Can Guppies Live with Mollies in The Same Aquarium Peacefully?

Can I keep mollies and guppies in the same tank? Guppies and mollies can generally live peacefully together in the same aquarium! They share many similarities, making them compatible tank mates:

  • Temperament: Both are peaceful, community fish that rarely show aggression towards other species.
  • Water parameters thrive in similar water conditions, preferring 75-82°F temperatures and slightly stiff, alkaline water (pH 7.2-8.2).
  • Diet: Both are omnivores and enjoy a varied diet of flakes, pellets, vegetables, and even brine shrimp.

However, there are some factors to consider for a successful cohabitation:

  • Tank size: Space is crucial. Aim for a minimum of 20 gallons for the first pair of guppies or mollies, then add 10 gallons for each additional fish. Mollies grow slightly larger than guppies, so a bigger tank ensures everyone has enough swimming space and avoids aggressive behavior.
  • Ratio of males to females: Keep the ratio of male guppies and mollies to females at 1:2 or 1:3 to prevent unwanted breeding and aggression. Male guppies can harass females relentlessly, and male mollies may exhibit fin-nipping if there aren’t enough females to spread their attention.
  • Plants and hiding places: Provide plenty of live plants and hiding places like rocks and driftwood. This creates a more natural environment, reduces stress, and allows both species to retreat if needed.
  • Water quality: Maintain excellent quality through regular water changes and proper filtration. Poor water conditions can weaken fish and exacerbate any potential aggression.

Guppies and mollies can thrive and add vibrant color and movement to your shared aquarium with proper planning and care. Keep an eye on their interactions and be prepared to separate them if any issues arise.

Mollies And Guppies: Fish Tank Requirements

Both mollies and guppies are popular freshwater fish in pet stores, known for their vibrant colors and peaceful behavior, making them excellent choices for beginner aquarists. However, when housing them together, it’s important to consider specific tank requirements to ensure their health and happiness.

Here’s a breakdown of what you need to know:

Tank Size:

  • Minimum size: Guppies can thrive in as little as 5 gallons, while mollies require a minimum of 10 gallons. However, a 20-gallon tank is ideal for both species for long-term stability and to accommodate potential breeding.
  • Species variations: Certain molly varieties, like sailfin mollies, grow much larger and need spacious tanks (at least 30 gallons). Consider the adult size of your chosen breeds when setting up the tank.

Water Parameters:

  • Temperature: Both enjoy warm water, with an ideal range of 75-80°F (24-27°C).
  • pH: They prefer slightly alkaline water with a pH of 7.0-7.8.
  • Water quality: Regular water changes and a good filtration system are crucial to maintain stable water parameters and prevent ammonia build-up.


  • reliable filter is essential for any aquarium, and the strength should be appropriate for the tank size and bioload (the amount of waste produced by the fish). Remember, mollies produce more waste than guppies.


  • Live plants are aesthetically pleasing and help absorb nitrates and improve water quality. Choose hardy plants like hornwort, java moss, or Amazon sword for warm water.
  • Hiding places: Both species appreciate cover, especially females and fry. Include rocks, driftwood, or caves for them to feel secure.


  • Mollies and guppies generally coexist peacefully. However, males can get territorial during breeding, so be mindful of the ratio. Aim for 1 male per 2-3 females for both species.
  • Avoid aggressive tank mates like cichlids or barbs that might harass the smaller guppies.

Additional Considerations:

  • Feeding: Both are omnivores and thrive on a varied diet of high-quality fish flakes, pellets, and occasional vegetables.
  • Lighting: Moderate lighting is recommended to replicate their natural daylight cycle.
  • Maintenance: Perform regular water changes (10-25% weekly) and gravel vacuuming to keep the tank clean and healthy.

Remember: Always research the specific varieties of mollies and guppies you want to keep before setting up your tank. Their needs may vary slightly depending on the breed.

By following these guidelines and providing proper care, you can create a thriving aquarium environment for your mollies and guppies.

How do you make mollies and guppies live together?

Firstly, ensuring the tank is large enough to accommodate both species is essential. A minimum tank size of 20 gallons is recommended to provide enough space for the fish to coexist peacefully.

Additionally, it’s vital to maintain good water quality and to provide plenty of hiding spots and plants for both species to feel secure. Both mollies and guppies are tropical fish, so it’s essential to keep the water temperature between 75-82°F.

Feeding the fish a varied diet of high-quality flake, frozen, and live food will also help keep them healthy and reduce aggression. It’s also a good idea to keep an eye on the male guppies, as they can sometimes harass female mollies. With proper care and attention to their environment, mollies and guppies can live happily in the same aquarium. 

Best Guppy Tank Mates

Guppies are peaceful and social fish that do well in community tanks. When choosing tank mates for guppies, it’s essential to consider their delicate nature and relatively small size.

Some of the best guppy tank mates include other peaceful fish like platies, mollies, and swordtails. These fish share similar water parameter requirements and are generally compatible with guppies.

Additionally, bottom-dwelling fish like Corydoras catfish and small, non-aggressive species of tetras can make good companions for guppies. However, avoiding aggressive or fin-nipping fish like bettas, barbs, or cichlids is important, as they can harm the guppies.

Avoiding large or fast-moving fish that may stress out the guppies is also a good idea. Overall, the best guppy tank mates are peaceful, non-aggressive species that share similar water requirements and won’t harm or stress out the guppies.

Guppy Tank Mates to Avoid

When choosing tank mates for guppies, it’s essential to avoid certain species that may cause stress or harm to the peaceful nature of these colorful fish. Aggressive or overly active fish like bettas, cichlids, and certain types of barbs should be avoided, as they may nip at the flowing tails of guppies.

Additionally, large or predatory fish like Oscars, larger tetras, or aggressive catfish should be kept in a different tank than guppies, as they may see the smaller fish as prey.

Some bottom-dwelling fish, such as loaches and some types of Corydoras, may also not be suitable tank mates, as they can outcompete guppies for food and may cause conflicts at feeding time.

It’s essential to research potential tank mates’ temperament and dietary needs before introducing them to a guppy tank to ensure a peaceful and harmonious community. 

Here are some tank mates to avoid when keeping guppies:

  • Large predatory fish: Guppies are small and peaceful fish, so they’re easy prey for larger fish like cichlids, Oscars, and Gouramis. These fish will see guppies as a tasty snack. 
  • Fin nippers: Some fish, like tiger barbs and tetras, are known for nipping the fins of other fish. This can stress guppies and make them more susceptible to disease. 
  • Bottom feeders that eat fry: Guppies are prolific breeders, so you’ll likely end up with fry (baby fish) in your tank. Some bottom feeders, like goldfish and koi, will eat guppy fry. 
  • Fish with different water requirements: Guppies prefer warm, hard water with a pH of around 7.2. Some fish, like discus and angelfish, have additional water requirements and won’t thrive in the same tank as guppies. 
  • Marine fish: Guppies are freshwater fish that can’t be kept with saltwater fish. Marine fish have different water requirements and will quickly die in a freshwater tank.

Here are some additional tips for choosing tank mates for guppies:

  • Choose fish that are similar in size to guppies.
  • Choose fish that are peaceful and won’t bother guppies.
  • Choose fish that have similar water requirements to guppies.
  • Do your research before adding new fish to your tank to ensure they’re compatible with your guppies.

What Other Fish Can Live With Mollies and Guppies?

Some good tank mates for mollies and guppies include small tetras such as neon tetras, ember tetras, and cardinal tetras. These colorful little fish are active and peaceful, making them a good fit for a community tank.

Another good option is the Corydoras catfish, which not only adds a bottom-dwelling element to the tank but also helps to keep the tank clean by eating leftover food and algae. Otocinclus catfish are also a good choice for this purpose.

Other suitable tank mates for mollies and guppies include small Rasboras, dwarf Gouramis, and peaceful barbs such as cherry barbs and gold barbs. When selecting tank mates for mollies and guppies, choosing similarly sized fish with similar water parameter requirements is vital to ensure a peaceful and harmonious community tank. 

What fish can live with mollies and guppies?

Mollies and guppies can coexist harmoniously with compatible tankmates such as platies, swordtails, and peaceful tetras. Maintain a suitable aquarium environment to accommodate the diverse needs of these species.

Can mollies be aggressive to guppies?

Mollies are generally peaceful but may nip the fins of guppies, especially in overcrowded tanks or with too few female guppies. Ensure ample space, maintain good water quality, and consider guppy varieties with shorter fins for a harmonious tank.

Can Molly and Guppy cross breed?

Can molly live with guppies and breed together? Yes, Mollies and guppies are very similar fish and can interbreed! They’re close relatives within the Poeciliidae family, sharing the genus Poecilia. Their offspring are called “guppies” when a male molly fathers them and “mollies” when a male guppy fathers them.

Which is better guppy or molly?

Both guppies and mollies make great aquarium fish, but choosing “better” depends on your needs! Guppies are livelier and easier to breed, while mollies are slightly larger and hardier.

Can mollies and guppies coexist with tetras?

Can guppy and molly live together with Tetra Fish? Yes, mollies and guppies can happily share a tank with most tetras! Both prefer similar water conditions and are peaceful community fish. Choose tetras like neon or cardinal tetras, and ensure ample space and good water quality for a thriving underwater community.

Can guppy fish and molly fish Live Peacefully Together?

Guppy and molly fish can live peacefully together in the same aquarium if the tank is appropriately sized, well-maintained, and suitable for both species.

What fish will cross-breed with guppies?

Guppies can crossbreed with other livebearers, such as endlers, mollies, and platies. However, keeping similar species together is advisable to maintain their distinct characteristics.

What Fish that Can Live Peacefully with Mollies?

Mollies can live peacefully with compatible tankmates like platies, guppies, swordtails, and certain peaceful tetras.

Do mollies eat guppies?

While not their primary diet, mollies might nibble on guppy fins, especially in overcrowded tanks or with insufficient females. Provide ample space, maintain good water quality, and consider short-finned guppies for a peaceful tank.

Can Molly and Guppies go together?

Can Molly fish live with guppies? Yes, mollies and guppies can happily cohabit in the same tank! They’re peaceful community fish with similar water preferences and enjoy similar hiding spots.

Are betta fish good with guppies?

Bettas and guppies can be tricky tank mates. Bettas’ territorial nature and long fins might lead to aggression towards guppies. Consider peaceful, short-finned guppy varieties and a well-planted tank with hiding spaces if attempting to house them together.


So, can mollies live with guppies? In conclusion, when creating a harmonious aquarium community, careful consideration must be given to the compatibility of fish species. While guppies and mollies are both popular choices among aquarium enthusiasts, it’s essential to understand their unique needs and behaviors. While guppies and mollies can coexist in the same tank, providing adequate space is crucial; monitoring the male-to-female ratio and ensuring a balanced diet for both species is vital. Following these guidelines can create a thriving aquatic ecosystem where guppies and mollies can live harmoniously together. So, can guppies live with mollies? The answer is yes, with proper care and attention.

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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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