Guppies: When To Introduce Babies To The Tank

when can baby guppies be put in tank

Baby guppies should be kept in a separate tank from adult fish, as they are likely to be eaten by their parents or other adult fish. They can be placed in the main tank once they are big enough that they won't be eaten by other fish, which is usually when they are about an inch long or between 6 and 8 weeks old.

Characteristics Values
Minimum size before moving to a big tank 1 inch long
Water temperature 80°F
Water change frequency Every week
Number of babies at one time 20-50
Gestation period 22-40 days
Birth duration Up to 6 hours
Age to join the main tank 6-8 weeks


Baby guppies should be at least an inch long before being put in the tank

Baby guppies are born extremely small, typically measuring between 7 to 10 millimetres in length. They are also born transparent, with a slight grey or black hue. Given their tiny size, they are highly vulnerable to being eaten by adult guppies and other fish species in a community tank. Therefore, it is crucial to separate them from adult fish until they are large enough to be released into the main tank.

The minimum size for baby guppies to be introduced into the main tank is about one inch in length. This ensures that they are too big to be swallowed by the larger fish. However, if the adult fish in your tank are particularly large, it is advisable to allow the baby guppies to grow a bit more before introducing them into the community tank.

To facilitate the growth of baby guppies, maintain their tank temperature between 76 to 80 °F (24 to 27 °C). This temperature range keeps them comfortable and stimulates their appetite, promoting healthy growth. Additionally, regular feeding with a mix of fresh and dry food is essential. In the first six weeks of their lives, they should be fed every 2-3 hours, or 5-6 times a day. After this initial period, you can reduce the feeding frequency to every 4-5 hours, or 3-4 times per day.

To enhance their growth, you can include supplements such as ground-up dried bloodworms, freshly hatched brine shrimp, and daphnia in their diet. These supplements not only provide additional nutrients but also make the meals more palatable for the baby guppies.

Besides diet and temperature, other factors such as diet, water conditions, and genetics influence the growth rate of baby guppies. To accelerate their growth, maintain optimal water conditions by cleaning the tank regularly and providing ample hiding places, such as plants, for the young guppies.

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Guppies are prolific breeders but also have cannibalistic tendencies

Guppies are prolific breeders, but they also have cannibalistic tendencies. In the wild, female guppies first produce offspring at 10-20 weeks of age and continue to reproduce until 20-34 months of age. Male guppies mature in 7 weeks or less. Guppies are live-bearing, and their gestation period varies from 20 to 60 days, depending on environmental factors. They can breed in both freshwater and marine aquaria.

Guppies have a mating system called polyandry, where females mate with multiple males. Multiple mating is beneficial for males as their reproductive success is directly linked to the number of times they mate. On the other hand, multiple mating can be disadvantageous for females as it increases their chances of predation and parasitic infection. However, females that mate multiple times tend to produce more offspring in shorter gestation periods, and their offspring tend to have better qualities such as enhanced schooling and predator evasion abilities.

Guppies are known to display filial cannibalism, or the consumption of their own offspring. This behaviour is not exclusive to guppies, and several reasons have been proposed to explain it. One theory suggests that guppies eat their fry to enhance their self-preservation instinct when under stress. Another explanation is that parent guppies weed out genetically weak offspring to improve the species' survivability. Additionally, some studies indicate that guppies practice filial cannibalism to ensure food and energy sources when resources are scarce.

To prevent cannibalism in a community tank, it is recommended to keep baby guppies separate from adult fish until they are large enough to avoid being eaten. The minimum size for baby guppies before introducing them to the main tank is about one inch long, but this may vary depending on the size of the fish already in the tank. It is also important to ensure that the tank is not overcrowded and that there are hiding places, such as plants, for the baby guppies.

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A floating breeder tank can be used to separate baby guppies from their mother

A floating breeder tank is an essential tool for keeping your baby guppies safe from larger fish in your main tank. These tanks can be used to separate baby guppies from their mother and other fish, providing a safe and secure environment for them to grow.

The floating breeder tank acts as a temporary home for baby guppies, giving them the time and space they need to reach a size where they won't be at risk of being eaten by their tank mates. It is crucial to monitor the health of both the baby guppies and the fish in the main tank before introducing them to each other.

One option for a floating breeder tank is the Marina 3-in-1 Floating Breeding Trap. This product serves as a breeding tank, isolation ward, and nursery for newborn fry. While it may not be ideal for baby guppies due to the wide slits at the bottom, it can still be useful for separating the mother from the babies. It floats freely in the tank and doesn't require attachment to an air line.

Another option is the Aquarium Fish Breeder Box, a self-floating transparent box that isolates baby guppies from adult fish. This product has received mixed reviews, with some customers reporting issues with suction cups and the size being smaller than expected.

When using a floating breeder tank, it is important to ensure that the baby guppies have access to adequate food and optimal water conditions to promote their growth. Guppies grow at different rates, so patience is key before introducing them to the main tank.

By using a floating breeder tank, you can give your baby guppies the best chance at survival and a healthy start to their lives in your aquarium.


Baby guppies should be fed every 2-3 hours for the first 6 weeks

Baby guppies, or fry, need to eat small meals frequently to support their rapid growth and development. In their first 6 weeks, they should be fed every 2-3 hours, or 5-8 times a day. Their tiny bodies can only eat so much in a single serving, so it's important to provide them with a lot of small meals.

Guppies kept in cool water may not eat enough to grow properly, so it's important to maintain a water temperature of between 76 and 80 degrees Fahrenheit for baby guppies. Warmer temperatures increase their activity and appetite.

Baby guppies should be fed a mixture of fresh and dry food. Freshly hatched brine shrimp are tasty to baby guppies and provide nutrients to help them grow and develop colouring. Dried bloodworms are another good option, as baby guppies love the taste and they provide additional nutrients. It's important to ensure that the food is ground up into small enough pieces for the baby guppies to eat.

Overfeeding can cause serious problems for guppies, so it's important to only feed them as much as they will eat within a couple of minutes. If food is left over after a couple of minutes, reduce the amount offered at the next feeding.

After the first 6 weeks, it's okay to decrease feedings to every 4-5 hours, or 3-4 times per day.

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The tank temperature should be between 76 to 80 °F (24 to 27 °C)

The tank temperature is a crucial factor in maintaining the health and happiness of guppies. As tropical fish, they thrive in warm water, and keeping the tank temperature within the optimal range is essential for their well-being.

The ideal temperature range for a guppy's water is between 74 and 82 °F (23 to 28 °C). However, it is important to note that the temperature should not exceed 80 °F (27 °C) to avoid creating an unsuitable environment for the fish. Therefore, maintaining a temperature between 76 to 80 °F (24 to 27 °C) is ideal. This range provides a comfortable environment for the guppies and promotes their health and growth.

Guppies can tolerate a wider range of temperatures, but it is not recommended to keep them in water below 72 °F (22 °C). They can survive for a short period in temperatures as low as 65 °F (18 °C), but their chances of developing diseases increase significantly. Keeping the temperature stable is crucial for the fish's health, as fluctuations can cause stress and impact their immune system.

To ensure the tank temperature remains within the optimal range, it is recommended to use a heater, especially in colder climates. A thermometer is also essential to monitor the temperature at all times. By providing a stable and comfortable environment, you can promote the well-being and longevity of your guppies.

Additionally, when making water changes, it is important to adjust the temperature of the fresh water to match the temperature in the tank gradually. This prevents shocking the fish with rapid temperature changes, which can be harmful. Maintaining a consistent temperature is crucial for the health and happiness of your guppies.

Frequently asked questions

Baby guppies can be put in the tank with adult guppies when they are about 6-8 weeks old. However, they should only be added to the tank when they are bigger than the mouth of the adult fish to ensure they are not eaten.

To prevent adult guppies from eating baby guppies, you can separate the baby guppies into a different tank or provide them with hiding spots. Hiding spots can be created by placing real or artificial plants in multiple places in the tank.

Baby guppies are ready to be put in the tank with adult guppies when they are bigger than the mouth of the adult fish. They should be at least an inch long, but the exact size depends on the size of the adult fish in the tank.

Some signs that baby guppies are sick include a bent or warped spine and laying at the bottom of the tank. If you notice any of these symptoms, remove the affected fry from the tank, as they are unlikely to survive and may spread illness to other fish.

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