Caracha Care Guide: Diet, Tank Mates, Diseases, Breeding & More

Updated: December 17, 2022

The Caracha is a beautiful freshwater fish that is native to South America. They are a peaceful fish that make a great addition to any community tank.

This guide will teach you everything you need to know about Caracha care. You’ll learn about their diet, size, lifespan, and more!

Species overview

Carachas (Astyanax fasciatus) are a freshwater fish that can be found in rivers throughout Central and South America.

They prefer calm waters with plenty of vegetation and hiding places. In the wild, their diet consists of small insects, larvae, and crustaceans.

Carachas are a peaceful fish that do well in community tanks. They are semi-aggressive toward their own species but get along well with other fish.

The main reason Carachas are kept as pets is for their unique coloration. They are silver with black stripes running vertically down their bodies. This makes them a popular choice for freshwater aquariums.



The Caracha is a very beautiful fish that is sure to stand out in any aquarium. They have a very long and thin body that is a pale white color.

The fins on this fish are also pale, except for the tips which are a vibrant black. The dorsal fin is very long and thin, starting at the middle of the back and extending all the way to the tail.

The Caracha also has a long and thin caudal fin that is forked. The pectoral and ventral fins are also quite long and thin.

This fish has large eyes that are a bright green color. The Caracha is a peaceful fish that is sure to add some beauty to any aquarium.


5-7 years

The lifespan of a Caracha fish is typically 5 to 7 years. However, there are a number of factors that can impact this. For instance, if the fish is not in optimal conditions, their lifespan will be shorter.


Carachas can grow to be between 4 and 6 inches in length. Males are typically larger than females, but there is not a significant size difference between the two.


Tank Size

The minimum tank size for a Caracha is 50 gallons. If you’re looking for a smaller freshwater fish, this is not the fish for you.

If you want to keep two Caracha fish in the same tank you’ll want to add at least another 50 gallons to that minimum number if you want them to thrive.

Another reason why you need to provide enough space is for the sake of enrichment and comfort. These fish like to roam and will often run gentle but steady laps around your tank. Giving them a little bit of extra space can go a long way in making sure they can comfortably turn around in the tank.

Water Parameters

Carachas are a tropical fish that come from the Amazon River Basin. As such, they prefer warm water with a neutral to slightly acidic pH.

The most important aspect of Carachas water parameters is stability. These fish do not do well with sudden changes in temperature, pH, or hardness.

Be sure to frequently test the water for ammonia, nitrite, and nitrate levels. Partial water changes should help keep these levels low.

  • Water Temperature: 75-86 degrees Fahrenheit
  • pH Levels: 6.0-7.0
  • Water hardness: 5-19 dGH
  • Alkalinity Levels: 3-10 dKH

What To Put In Their Tank

When it comes to setting up an aquarium for Caracha, there are a few things you’ll need to take into consideration.

The first thing is the size of the tank. This species can get quite large (up to 24 inches in length), so you’ll need something that can accommodate them. A 125-gallon tank is a good starting point, but you might need something even bigger depending on how many fish you want to keep.

The second thing to think about is the substrate. Caracha are known to be heavy diggers, so you’ll need something that can stand up to their abuse. We recommend a gravel substrate since it’s sturdy and won’t be easily displaced.

As for decorations, it’s really up to you. These fish don’t have any specific needs, so you can get creative. That said, we recommend sticking with some basic plants and rocks.

Too many decorations will make the inside of the tank feel cramped and could lead to aggression.

Last but not least, you’ll need to make sure the tank has a tight-fitting lid. Caracha are known to be good jumpers, so you don’t want them making a break for it!

Common Diseases

The Caracha is a hardy fish, but that doesn’t mean they can’t get sick. There are a few diseases you should be on the lookout for, the most common being ich.

Ich is a very common freshwater disease that can affect any fish, and the Caracha is no exception. The most obvious symptom is the presence of white spots on the body, fins, and gills of your fish.

If you see this, it’s important to act fast. Ich can spread quickly and can be fatal if left untreated.

Another disease to look out for is hole-in-the-head disease. This is most commonly seen in cichlids (like the Caracha), and it’s caused by poor water quality and the presence of activated carbon in the tank.

This disease will present itself as one or two pits/holes in the skin of your fish’s head. While it’s almost always curable, it will usually leave some scarring on your poor fish!

The best way to prevent these diseases is by maintaining the water quality in your tank. A clean and well-maintained tank will go a long way in keeping your Caracha healthy and disease-free.

Behavior & Temperament

Caracha are very peaceful fish. They typically don’t bother other tank mates and mind their own business. The only time you might see them become aggressive is if they feel threatened or are not getting enough food.

These fish are also quite shy. They like to hide and will often stay hidden during the day. They’re more active at night, which is when you’re likely to see them swimming around and looking for food.

Caracha are also known as “dither fish”. This means that they help other fish feel more comfortable in their environment. They do this by constantly moving around, which makes it seem like there’s nothing to be afraid of. This can be helpful if you have shy fish that are hiding all the time.

Tank Mates

Carachas are a schooling fish, so they need to be kept in groups of at least six. They’re also semi-aggressive, so tank mates need to be chosen carefully.

Carachas are known to nip at the fins of other fish, so peaceful species are a no-go. These fish do best with other semi-aggressive fish that can hold their own.

Some compatible tank mates for Carachas include:


Carachas are a little bit more difficult to breed than some other species of fish. They’re not the most cooperative when it comes to spawning and they can be a bit finicky about their environment.

The first thing you need to do is set up a breeding tank. It should be at least 30 gallons and have a nice, sandy bottom. The water should be on the soft side with a pH around 6.8.

Add some live plants and a few pieces of driftwood for decoration. Then, start to acclimate your fish to the new environment.

When the fish are comfortable, it’s time to start feeding them. Live foods are best, but you can also use high-quality frozen foods.

After a few weeks, you should start to see the females getting larger. That’s a good sign that they’re full of eggs.

Once the females are ready, the males will start to chase them around. That’s when you know spawning is about to occur.

The female will lay her eggs on the plants or driftwood. The male will then fertilize them. After that, it’s up to the parents to care for the eggs.

The eggs will hatch in about a week. You can then start to feed the fry live foods. Baby brine shrimp are a good option.

As they grow, you can slowly start to introduce them to flake food and other pellets.


Caracha fish are a great addition to any freshwater aquarium. They are hardy and can tolerate a wide range of water conditions. They are also peaceful and get along well with other fish.

The only downside to owning a Caracha fish is that they are known to be jumpers. So, you will need to make sure your aquarium is covered.

Other than that, we think they make great fish for both beginner and experienced aquarium hobbyists alike.