Guppy Fish Care Guide

Guppy Fish Care Guide

Guppies are one of the most well-known and popular freshwater fish for both beginners and seasoned aquarists alike. Guppies add plenty of colour to tanks and are peaceful, cheap, and very easy to maintain.

In this article, we’ll be looking at everything there is to know about guppies: how to care for them, their perfect diet, their ideal habitat and tank mates for them, how to breed them, and much more.

Guppies Facts & Overview

  • Care Level: Easy
  • Temperament: Peaceful
  • Colour: Every colour imaginable
  • Lifespan: ~2 years
  • Size: 0.6 – 2.4 inches
  • Diet: Omnivore
  • Family: Poeciliidae
  • Minimum Tank Size: 5 gallons
  • Tank Setup: Freshwater, plants, substrate
  • Compatibility: Other peaceful community fish

Guppies are freshwater tropical fish from the Poeciliidae family and native to South America. Poecilia wingei (also known as an endler guppy) is also part of the Poeciliidae family and is closely related to the common guppy (Poecilia reticulata). It is the Poecilia reticulata that we’ll be discussing in this article.

There are almost 300 varieties of guppies. They come in all different types of colours, sizes, and tail shapes.

Their name is derived from Robert John Lechmere Guppy, who found them in Trinidad back in 1866. It was taken back to British Museum and given the name Girardinus guppii, by an an Ichthyologist. Since then, the fish has undergone a few name changes, including Lebistes reticulatus and is now known as Poecilia reticulata.

They are also known by a few other common names such as The Millions Fish (because of their amazing breeding rate) and The Rainbow Fish (because of the wide variety of colours they come in).

Poecilia reticulata

As well as the beautiful colour and active nature they bring to the tank, they have also been used in freshwaters in Asia to control the mosquito population; however, in some cases, their release had a negative impact on the native fish populations.


Guppies are peaceful fish that like to be kept in groups. They’re active swimmers and pretty much move around all the time.

You’ll often see the males chasing the females trying to impress them by wiggling their fins. If your fish are constantly hiding, it could be an indication that they are stressed or ill.

Appearance of Guppies

As we’ve already mentioned, Guppies come in many different colours and sizes, with different shaped tails too.

In the wild, females are typically grey and males have colourful stripes, spots, or splashes in a wide range of colours. There are so many aquarium varieties due to breeders creating new strains with brighter colours and more patterns on their bodies and tails; even today, there are still new varieties being introduced.

Males are typically smaller than females, averaging between 0.6-1.4 inches, whereas females are around 1.2-2.4 inches long.

These fish are sexually dimorphic, which means you can tell the males from the females just by looking at them. We’ll discuss more on how to do this in the breeding section.


These fish come in almost every colour imaginable, which is where they get the nickname ‘Rainbow Fish’ from. They are normally a paler colour on the top and upper half of the body, and the rear part is usually a brighter, more vivid colour. Some varieties can also look metallic. They have iridophores which are cells that don’t have colour and reflect light which creates an iridescent effect.


Some are solid in colour; others have a pattern over their main body colour. Examples include:

  • Cobra: vertical barring and rosettes.
  • Snakeskin: chain-link pattern and rosettes.
  • Tuxedo: front and back half and two different colours.

Again, the tail can also be either a solid colour or patterned. Here are some examples:

  • Grass: tiny dots which look like grass.
  • Lace: fine web-like pattern.
  • Leopard: spots that look like leopard spots.
  • Mosaic: irregular spots that connect to each other.

Tail Shape

You’ll find a wide variety of tail shapes too including:

  • Fan-shaped
  • Triangular shaped
  • Sword-shaped (double, top sword, and bottom sword)
  • Flag shaped
  • Spade shaped
  • Rounded
  • Spear shaped
  • Lyretails

Habitat and Tank Conditions

Habitat and Tank Conditions

Their natural habitat is in the warm freshwaters of South America, so it’s important to replicate these conditions into your tank to provide them with the most natural environment possible.

As with any fish tank, you always need to make sure that the tank is set up correctly, and that the water is properly cycled. This ensures you have the appropriate bacteria’s which will convert harmful compounds into less harmful ones.

Most people choose a ten-gallon tank to keep Guppies in, but you can keep them in a 5 gallon, or anything upwards of a ten-gallon.

You’ll need to use a heater to keep the water in between 75 to 82OF. Always place your heater at one end of the tank, and a thermometer at the other end to check that the water is heated through consistently. Whilst they can tolerate a wide range of waters, and pH’s, from 5.5-8.5, the most ideal pH for them is between 7.0 and 7.2.

As with the majority of fish, you’ll also need a filter – the type you choose will fall down to the size of your tank and your personal preference. A hang-on back filter will be fine for most setups. If you keep your fish in a large tank (bigger than 50 gallons) you might want to consider using an external canister filter.

The set-up of your tank will depend on your intentions for keeping this fish. Do you want to just keep them to care for, do you want to breed them, do you want to keep all males or females?

Show Tank: Plant the tank up with plenty of live plants, rocks, and substrate. Ideal plants to keep these fish with include hornwort and Amazon sword plants. The type of substrate you choose is entirely down to personal preference. Guppies spend the majority of their time in the middle or top section of the tank.

Breeding Tank: Keep your tank bare-bottomed, that way uneaten food can be sucked out easily. Use floating plants (such as Java Moss) to create a place for your fry to hide in. The plants also help aid filtration.

As we mentioned earlier, if your adult fish are constantly hiding – it may be a sign that they are stressed, they should usually be found swimming in the open.

Regardless of the setup, make sure you clean your tank weekly and perform a partial water change of around 25%.

Tank Mates

Tank Mates

The most common tank mates for a Guppy are more Guppies! The majority of people who keep these fish do so because they like the vibrant colours of the males. If you’re only keeping them for their looks, we recommend that you keep males only. You can keep one Guppy per 2 gallons of water; for example, you can keep 5 in a 10-gallon tank and 10 in a 20-gallon tank.

If you choose to keep both males and females, keep them at a ratio of 2:1.

They can also be kept with other peaceful community fish such as mollies, platies, gouramis, Corydoras, and peaceful tetras. Almost all livebearers such as ender’s livebearers and swordtails can make ideal tank mates for them too.

You should avoid housing them with larger aggressive species, especially if they’re likely to make a meal of them. Keep them away from species such as red tail sharks, barbs, and aggressive tetras. They will nip at their fins. If you want to keep them with other non-fish animals, you could house them with ghost shrimp or African dwarf frogs.


The food that fish eat depends on what’s available in their natural environment as well as their anatomy. Their main diet should be good quality fish flakes. Ensure you choose a product that is high in protein and not filler foods. To ensure this, check the order of ingredients (ingredients are listed by weight). High-quality foods will have proteins listed first (for example, other fish, shrimp, and meaty products).

Avoid fish flakes that have fillers such as wheat and soy listed as the first few ingredients.

To supplement the fish flakes you can feed your fish either live or frozen foods such as shrimp and bloodworms. You can also give them vegetables such as peas, lettuce, and cucumber.

Fish stores sell triangular cone feeders which you can use to feed them live and frozen foods such as bloodworms. The fish can then swim up to the cone, which is a little like plastic mesh, and pull food out of one of the many holes.

You should feed your fish once or twice a day, and only an amount of food which they can eat within two minutes.

Don’t feed your fish only one type of food because this will lead to nutrient deficiencies. You should alternate between flake food, live/frozen food, and vegetables. You could feed them flakes in the morning and an alternative in the evening.

If you overfeed your fish, this can lead to problems with their health and affect the water quality in your tank. By following the rule above, there shouldn’t be any leftover food in the tank, but if there is – you can just remove it using a net so it doesn’t settle on the floor and start rotting.

If you have fry in the tank, you’ll also need to think about how to feed them. They will need to be fed smaller amounts, more frequently. You can feed them either the same foods as the adults, but crushed up, or you can buy specific fry food. Feed them around four to five times per day.


Guppies breed like crazy. They are certainly not shy, and will most likely breed without any input from you. There are lots of different ways that fish breed. Guppies are ovoviviparous, which means that the females grow the fish inside their bodies, inside an egg. The baby fish use the egg sac for nourishment, and once they have absorbed that they hatch inside the female and the female gives birth to live young. It’s really easy to sex these fish once they reach sexual maturity (between three and five months). They have a number of tell-tale signs:

  • Colouring; males are usually much brighter and vivid in colour than females.
  • Modified anal fin; males have a modified anal fin which is known as a gonopodium. It is longer and narrower than a female’s anal fin. Some species even have a pair of claws at the tip.
  • Males are smaller than females.
  • Females often have a gravid spot (a dark spot just behind the anal fin, which gets darker during pregnancy).

So how do they actually breed?

It is thought that males are able to determine which females are virgins and which are already pregnant.

The male fish makes brief contact with the female and fertilization occurs when he passes a package of sperm known as spermatophores into the females. The packet then splits up into thousands of sperm and the female store this to create a number of broods. She can have multiple pregnancies from only one fertilization over a period of time.

So how do they actually breed

It takes between four and five days from when the egg is fertilized to the embryo being nearly completely formed. For the rest of the gestation period, the fish develop organs. The gestation period is usually between 21 and 30 days. Towards the end of her pregnancy, you may be able to see the eyes of the babies through her translucent skin.

Once she gives birth to the live fry, the process will then repeat again, and she’ll give birth in a further 21-30 days. As we mentioned earlier, if you have a female and male Guppy in a tank they are likely to breed regardless of any input you have. You can either choose to put the female in a breeding trap, use a breeding tank around a week before she is due to give birth or remove the female fish once the fry is born to prevent her from eating them.

If you choose to use a breeding trap, we don’t recommend you use the small plastic ones available; they stress fish out. Instead, make your own larger trap to give her plenty of space to swim. Include holes for the fry to swim out of. If you place her in a breeding trap that is too small you’ll stress her out and this may lead to a miscarriage. When using a specific breeding tank, keep the bottom of the tank bare, and use plants such as java moss which allow the fry to hide.

Common Diseases

Guppies are very hardy fish; however, their long tails can make them prone to fungal infections. Ich is common amongst these fish. This is a disease where small white dots grow on the fish’s skin and you’ll notice them rubbing their bodies against objects. To get rid of ich, you can use medication available from your local pet store.

They are also prone to fin rot; the tail will look likes it’s torn. Again, this can be treated with medication and prevented by choosing suitable tank mates who won’t nip.

To reduce the chance of disease entering your tank:

  • Keep the water conditions optimal.
  • Carry out regular water changes and maintenance checks.
  • Always rinse everything, or put things in quarantine before adding them to your tank.
  • Keep their stress levels low.
  • Feed them a varied diet.
  • Don’t overcrowd them.

Are Guppies Suitable for your Aquarium?

Guppies are a very colourful and peaceful fish, perfect for both beginners and experienced fish keepers.

They are hardy and make an ideal first-time fish, but also come in a wide range of colours, patterns, and tail shapes which makes them appealing to experienced fish breeders.

Keep their water clean, and provide them with a well-balanced diet and you’ll be rewarded with a group of entertaining, active swimmers for your tank.