• Scientific name: Poecilia reticulata
  • Common names: fancy tail guppy, millions fish
  • Maximum size: 2.5″ (6cm)
  • Lifespan: typically around 2 years.
  • Tank size: at least a 10 gallon aquarium
  • Caring hardiness: one of easiest fish to care for
  • Temperature range: 66 – 84°F
  • pH range: 7 – 8.5
  • Hardness: 8.0-30.1
  • Temperament: peaceful.

Guppies are highly prolific livebearers, they are also one of the most popular fish kept by fish hobbyists on the world today. This is largely due to the fact that they are simple to take care of, prolific breeders and striking in appearance.



Guppies come in a wide variety of patterns or strains as well as a multitude of tail shapes. They have been bred for a variety of colors, patterns and fin shapes and are generally named for the color of their tail, tail shape, and body coloration.

Male guppies can have almost any color variations, from red, yellow, blue, black, gold and green. They are much more colorful than the females which are usually a plain color such as gray or brown. Occasionally though, females can have some brighter color variations.


Females are larger than the males in their size, have a rounder anal fin and are not as brightly colored as the males. The females are pregnant and give birth thorough their lifetime.

Guppy tank setup

Guppies in a community aquarium

Guppies prefer dark graveled tank bottoms and lots of leafy plants that provide them some vegetable foods from algae and are needed to protect the young from being eaten. A female may also retreat to the plants when it’s time to give birth.

Guppies prefer a hard water aquarium with the pH in somewhere in the range from 6.8 to 7.4. Kits to test both pH and hardness can be purchased from your local aquarium or pet store. One tablespoon of salt for each five gallons of water should be added if you have very soft water.

The water in which you keep your guppy should be changed about once a week. This involves siphoning about 25% of the water from the tank using a vacuum tube. The vacuum tube allows you to also remove any debris from within the gravel.

Guppies are peaceful fish that can get along with almost any other type of fish. Being a schooling fish, it does best when housed in groups of five or more of the same species. Does best in a planted community tank with no fin nippers. Besides, they should be kept with fish of the same size range, large fish will often eat guppies.

Foods and feeding

Like all fish it is important to feed guppies a varied diet that will actually help in enhancing their colors. As well as standard tropical flakes you should also include freeze dried foods or live fish food such as brine shrimp, brine eggs and worms into their diet. Besides, they are also quite fond of plant matter.

Feed your fish small amounts three times a day. It is important to not overfeed your fish as the uneaten food will rot and effect the quality of your water. If you have young fry a diet high in protein is important, extra protein can be introduced to their diet by boiling an egg yolk and slicing it finely.

Guppy common diseases and treatments

Ichthyophthirius: A parasitical disease that appears on the fishes body as small white spots. You may notice the fish rubbing up against objects in the tank in an attempt to remove the parasite. There are numerous commercial treatment available for treating Ichthyophthirius.

Fin Rot: Fin rot is a bacterial infection that generally occurs on the guppies large tail fin. The disease is often started when a guppies fins are nipped by another fish, leading to infection. If you are having problems with fin rot try to locate any fish that are nippy and remove them to another tank. Speak to your local fish shop expert to find a commercial treatment for fin rot.

Hemorrhagic Septicemia: A bacterial infection that can be identified by red streaks on the fins of your fish or red dots on the body. This disease is caused by excess levels of nitrate and ammonia in your tanks water, you should perform daily water changes with conditioned to get these levels under control. Fish infected can be treated with an antibacterial solution to reduce the symptoms.

Ammonia poisoning: Fish suffering from ammonia poisoning can be seen gasping at the surface of the water and their gills will appear red and inflamed. Ammonia poisoning is common in new tank setups, water should be replace with conditioned water and additional aeration should be provided.

5 simple steps to breeding guppies

Select your breeding stock


For you first attempt at breeding guppies, fish purchased from your local aquarium will be perfectly suitable. As you get more serious or if you are interested in breeding for show then breeding stock can be purchased directly from a specialist breeder.

Aquarium brought fish are generally bred from the same gene pool by aquarium shop owners, this can lead to undersized and dull fish as you continue to breed from the same gene pool, you can avoid this by purchasing your fish from different sources.

The male guppy should be your most striking guppy and the specimen you would most like the new offspring to resemble. Females should be compact with a thick tail and brightly colored tail fin. If the fish you have chosen to breed are related the offspring will resemble their parents more than if the fish where not related.

Setup the breeding tank

The best tank size for breeding Guppies is around 10 gallons, you could go as small as a 5 gallon fish tank if you don’t have the room for a larger tank. Guppies should be kept in water temperatures of 65-68 degrees F (18-20 degrees C) but for a breeding tank the temperature should be increased to 74-78 degrees F (23-25 degrees C).

Leave the base of the tank gravel free and install some floating plants like Java Moss for the newborn fish to hide as mothers often eat their own young. Cover the filter with panty hose as they can easily suck up the small newborn fish.

If you don’t have the space or money for a dedicated breeding tank you can use a floating breeder box. Floating breeder boxes are small plastic containers that you can place in an existing fish tank. They have a V shaped groove at the bottom with a small slot that allows newborn fish to slip into, this prevents the mother fish or any other fish in your tank from eating the young.

Place breeding fish into tank

Once you have established your breeding tank place your selected male fish and 2-3 females in the tank. You are best to put 2-3 females as this will stimulate the male more than having a solitary breeding partner and a selected pair of fish may not always become a compatible mating pair.

When mating is about to commence you will notice that the male performs a dance like movement in front of the females to attract their attention. The fish will then come together and the male will insert its anal fin into the female for fertilization.

You will be able to tell when a female has become pregnant as the dark spot on the fishes belly will become larger and darker in color. This spot is known as the ‘gravid spot’ and is in fact the eyeballs of the young fry inside the mother.

Once you have confirmed that a female is pregnant you should remove the male fish from the tank. The gestation period for a guppy is about 30 days, the female will generally give birth around 3 weeks after you notice she is pregnant. Each female can give birth to between 20 and 100 young at one time; however, around 30 is more the norm.

Raising the guppy fry


The newborn fish will be looking to feed almost immediately, the best food at this stage of their life is the ground up fish flakes. Once the fish have grown slightly it is good to introduce more nutrition into their diet in the form of newly hatched brine shrimp and small blood worms. A cooked egg yolk finely diced is also a good source of protein for growing fish.

Any fish that don’t survive should be removed from the tank as soon as possible to prevent disease. Once your new guppies are around 1-2 months they should be large enough to safely place in the tank with your other fish.

Some tips for breeding Guppy

Solitary male guppies may not always be interested in breeding, you can sometimes spark their interest by adding some competition. Add a divider to your breeding tank and place another male guppy into this divided area (separate from the breeding male and females). The threat of this new male will often encourage your breeding male into action.

If you are using a plastic breeder box do not place the female inside until you are sure she is close to giving birth. While the gestation period for guppies is usually about 28 days it can sometimes be up to 40 days. As you cannot be exactly sure when a female is going to give birth an extended periods in the breeding box can be stressful to the fish, this is one of the downsides to using a breeding box as opposed to a dedicated tank.

Feed your newborn fry less more often, that is, give your fish numerous small meals throughout the day as opposed to one large meal.

Even if a female guppy has given birth and has not been in contact with another male guppy they may give birth to additional batches of newborn. This is because guppies are capable of giving birth multiple times from just one fertilization by a male.

You should purchase your male and female guppies from different stores to prevent inbreeding. Unfortunately the quality of guppies sold at aquariums is of a lower standard than in the past due to large amounts of inbreeding. You can help widen the gene pool by sourcing your fish from different suppliers.

You should sterilize nets or any other implements that will be in contact with your tanks water. The best way to do this is immerse them in boiling water. Sterilization is even more important when dealing with newborn fish as they are for more sensitive to changes in water conditions.

Guppies can sometimes give birth of up to 50 babies. You need to be prepared for this scenario by having a place for all your new fish to live. If you don’t have the tank space to accommodate all of your new fish you can give them to friends or some pet shops/aquariums may even give you cash or store credit for your donation.

Java Moss is the best plant to provide hiding spots for newborn fry. It has low light requirements and as it is a floating plant does not need to be planted in gravel.

Certain types of aquarium filters can be dangerous to newborn fry. To prevent small fry from being sucked into a filter you can cover the inlet holes with some panty hose.

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