When Can Tetra Fries Go In The Main Tank?

Tetras are pretty amazing breeders, so it is important to know how to deal with tetra pregnancy. One thing to keep in mind is what to do with the resulting fry. So, when is the best time to add them back to your main tank? And what should you think about before doing so?

Today, going to find out about tetra fry and what you need to know before you introduce them to your main aquarium.

Here is the quick answer,

When can tetra fries go in the main tank? You can safely put baby tetras into your regular aquarium at around 6-8 weeks old. By this time, tetra fries have grown quite a bit and are usually too large to be eaten by your adult tetra fish. Just be sure to double-check that they are bigger than your adult fish’s mouth before you introduce them to the main aquarium.

When Can Tetra Fries Go In The Main Tank

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What Are The Factors To Consider Before Mixing Baby Tetras With Adults?

Did you know that tetras can be cannibals? It is true, And while it’s common for adult tetras to snack on their own fry, there is a bigger issue here. Actually, lots of fish species will eat their young if given a chance. So, what should you think about before mixing tetra fry with the adults?

What Are The Factors To Consider Before Mixing Baby Tetras With Adults

Let’s take a look:

Size of the Tetra Fries

So, one of the key things to consider is the size of your baby tetras. If they are too small and young, they will likely be seen as a tasty snack by the other fish in your tank. It is a classic case of “big fish eat small fish,” and even tetra moms can sometimes chow down on their own fry.

To avoid this, I suggest waiting until your tetra fry is a decent size before introducing them to the main tank.

This way, they will be too big to be seen as prey by the adults, and you’ll create a safer environment for them. Of course, the size they need will vary depending on the other fish in your tank, but a good rule of thumb is to wait until they are at least 1 inch in size.

Age of Baby Tetra fries

When it comes to tetras, age, and size tend to go hand in hand. The older they get, the bigger they will become within the limits of their own species.

But how long does it take for them to reach their ideal size? Well, that depends on a few factors, like the environment they’re in, their diet, and the water temperature.

If you want your tetra fry to grow up strong and healthy, you will want to make sure they are getting a varied diet that’s rich in protein and animal fats.

To help with this, you can make a homemade paste using ingredients like egg yolk, beef heart, brine shrimp, daphnia, spirulina, and veggies. These foods will give your tetra fry the nutrients they need to thrive and develop properly.

When speaking of the environment, the water temperature is also key. Keeping your tetra fry in water that’s around 75- 80°F is ideal for their growth phase. So, keep these tips in mind, and you will have some happy, healthy tetras in no time.

Read More About: – Is Tap Water Safe for tetra Fish?

Health Condition Of tetra fries

It is essential to keep your pregnant female tetras separate from the rest of your fish before they give birth. Why? Well, because some of the fries might develop a parasitic infection or a disease that could easily spread to all the other fish in your tank. And that would be a total bummer, right?

To avoid this, I recommend keeping the fry separated for the 2-3 weeks it takes for them to grow big enough for the main tank.

This period will also act as a sort of quarantine, giving you time to monitor the fry and spot any signs of illness.

Trust me. You don’t want to introduce a sick fish into your main tank, especially if the symptoms are not obvious.

If you do spot any issues, it’s essential to treat them before introducing the fry to the main tank. Even minor conditions can quickly escalate and put your whole tetra population in danger. So, be vigilant, take care of your little tetras, and you will have some healthy, colorful fish.

Adding More Hiding Spaces To Them

When it comes to tetra fry, size is not everything. Even if they are big enough to survive in the main tank, they still need somewhere to hide and feel secure. That is why it’s important to make sure your tank has plenty of hiding places for your little tetras to retreat to.

Having hiding spots will also help keep your tetras stress-free, which is essential for their immune system. And who does not want healthy, happy fish?

The good news is that there are lots of different tank decorations you can use to create hiding spots for your tetra fry. Plants, wood, caves – there are plenty of options to choose from. Plus, it will make your aquarium look even more fantastic. So, get creative, keep your tetras safe, and enjoy your awesome tank.

Number Of Adult Tetras In the tank

If you are planning to add tetra fry to your tank, it is essential to consider the number of adult tetras you already have swimming around. Having too many adults can put stress on the little ones, making it harder for them to survive.

That’s why it is a good idea to keep the number of adult tetras in the tank to a minimum. This way, there will be fewer fish hunting or stressing out the fry. Plus, if you are planning to add lots of fry at once, you definitely don’t want to overcrowd your tank.

Read More About: – How Many Tetras Should You Keep Together?

So, keep things simple and give your tetra fry the best chance of survival by keeping the number of adult tetras in your tank under control.

How to Add Young Tetras in the Main Tank?

So, you are ready to move your tetra fry into the main tank? But before you do that, you need to make sure you are prepared for a safe and smooth transition. Keep in mind that tetra fry has different needs than adult tetras, including different water parameters such as temperature.

How to Add Young Tetras in the Main Tank

So to transfer your fry safely, there are two strategies to consider:

First Feed Adult Tetra fish tank

So, to avoid any mishap, it’s important to feed the adult tetras before introducing the fry. Otherwise, they might confuse them for food because of their small size.

Feeding the adults will make them less aggressive and more accepting of the newbies, at least for a few hours.

During this time, the fry can explore their new surroundings and find safe places to hide. They will quickly learn how to avoid the adults and navigate around the tank.

Make Sure to Acclimate Your Tetra Fry to the Main Tank Gradually

You don’t want to shock your little buddies with a sudden change in environment, so make sure you follow these simple steps:

  • Gather all the fry in a plastic container with water from their own tank.
  • Put the container into the main tank and leave it there for around 30 minutes to equalize the temperatures between the two environments.
  • Add some tank water into the plastic bin every few minutes until the container is full.
  • Allow the fry to get used to the mixed water for another 30 minutes or so.
  • Move them into the main tank using a fishnet, but remember to throw away the water from the breeding tank instead of pouring it into the main tank.
  • The acclimation process might take a bit of time, but it’s worth it to ensure your tetra fry are comfortable and healthy in their new home.


In conclusion, taking care of tetra fry is all about providing them with a safe and comfortable environment. To ensure their survival, you can either let the pregnant female tetra give birth in the main tank or separate her from the other fish.

If you choose to grow the fry in a separate tank, make sure you feed them a varied diet rich in protein and animal fats.

Additionally, it’s essential to provide them with plenty of hiding spots and decorations to minimize stress and protect them from adults.

When transferring the fry to the main tank, make sure you feed the adult tetras first and follow a gradual acclimation process to minimize shock. By following these tips, you can successfully raise tetra fry and enjoy its vibrant colors and playful behavior in your aquarium.

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