While carnivorous freshwater aquarium fish are pretty aggressive, they are one of the most sought-after types in the aquarist community.

Why are these fish so popular? Many novice aquarists regard aggression as a negative trait but brings certain benefits.

Most aggressive species are relatively neat and intelligent. They can build ties with the owners, although most peaceful species can’t.

If you want to keep them with other species in your take, it’s best to understand these fish deeply. Let’s scroll down this article!

Most Aggressive Carnivorous Freshwater Fish

Aggressive fish can harm other species or even their fellows. However, they also make great pets if you follow the plan.

Below are the most aggressive carnivorous freshwater species you can introduce to your aquarium:


The Arowana may reach a maximum size of 36 inches, but most only achieve a median length of 24 inches.

Because they can consume most freshwater tank species, the sheer size of this species makes it difficult to share an aquarium with others.

The territorial and predatory habits of Arowanas are unsuitable for social tanks because of their outstanding swimming abilities.

This meat-eating species requires a 250-gallon landscaped aquarium to thrive.

Besides, it might be challenging to feed this species anything except living food. Shrimp, feeder creatures, and crickets are all excellent protein sources for them.

Red-bellied Piranha

Piranhas are predatory freshwater species with razor-sharp teeth endemic to South American lakes and rivers.

They’re notorious for their fury, but their aggressiveness isn’t as bad as it appears.

Red-bellied piranhas, contrary to popular belief, really aren’t predatory animals. Only when diving in a shoal, can they become violent.

In nature, crustaceans, worms, fish, and insects are the principal food sources for red-bellied piranhas.

Because they are carnivorous and territorial, keeping them in a single species aquarium is preferable.


Pufferfish are tenacious freshwater species that pass the communal tank incompatibility test with flying colors.

They’re predatory, violent, and territorial. These creatures will eat creatures that aren’t quite as big as they are.

They will also bully and attack species of similar size, and their toxic spikes can be dangerous to other predators in an aquarium.

Therefore, even though they’re being bullied, they are hazardous!

They eat shellfish, crabs, snails, and tiny creatures in nature.

Carnivorous Freshwater Fish Diet

When given a diversified diet, most predators will grow. Meat-eating fresh fish need a diet rich in protein and excellent in quality.

You should add various food sources, including frozen food, live food, and even supplemented store-bought flakes or pellets for these creatures.

Avoid feeding your pets any chicken or red meats because these foods are not in their diet and may be quite harmful.

Pellets formulated for large predatory species are the most excellent staple diet.

If you keep these creatures in your tank, it’s best to add frozen foods such as shrimp, shellfish, or fish fillets to their diet.

Crickets, mealworms, and earthworms are examples of live invertebrates that provide an excellent natural food source.

Feeding live feeder species to your carnivorous species is not a good idea. These feeder creatures may infect your aquarium with parasites and sickness.

While feeding these creatures with spines or sharp teeth, be cautious since accidents might occur when the species become excited.

Carnivorous Freshwater Fish Tank Mates

Aggressive fish are not suitable for community aquariums. The most aggressive types are ideal for keeping in a single tank.

However, you can introduce semi-aggressive fish to your aquarium as long as you keep them with suitable tank mates and a massive setup.

The key is to avoid retaining any creatures that are tiny enough to kill and eat.

There’s always the risk of conflict and aggression. Therefore, it’s always best to have a second plan if your pets need relocating.

Moreover, the tank size where you keep your carnivorous fish will determine whether you can identify appropriate tank mates or not.

A big enough aquarium will allow species to move and hide while ignoring lesser fish.

Popular Carnivorous Freshwater Aquarium Fish Species

The following list of carnivorous freshwater fish can help you narrow down your selections and choose a variety that appeals to you. Let’s see!

Wolf Cichlid

These aggressive cichlids are incredibly aware of the environment and appear to be constantly looking for their owners.

These ravenous eaters are piscivorous, meaning they eat other species.

Although some daring monster creature owners have maintained them alongside tank mates, raising them in a single aquarium is best.

Jaguar Cichlid

Jaguar cichlids are wolf cichlids’ smaller relatives. The spotted patterns on these gorgeous aquatic creatures are incredible.

Their robust jaws and sharp teeth match the aggressive behavior of these cichlids.

It’s a good idea to keep these creatures alone or in an aquarium with other giant cichlids that can stand up to them.

Green Terror Cichlid

Green terrors are incredibly beautiful South American cichlids featuring a turquoise green body and red and black fins.

Males are substantially bigger than females. They are pretty aggressive, especially during the breeding season.

It’s simple to keep a few of these species in a giant aquarium on their own. However, introducing them to a community tank is a different story.

When mating season arrives, a couple of these creatures will kill and eat any other species.

Red Devil Cichlid

These ferocious cichlids may be as cruel to their group fellows as to other aquarium buddies.

Thus, it’s best to invest in a tank as big as possible.

Because red devil cichlids enjoy changing their tanks, expect the decorations and ornaments to be rearranged.

If you want to know more about Red Devil Cichlid care, you can watch this video:


Texas Cichlid

These fantastic fish aren’t picky eaters and are excellent for aquarists new to aggressive creatures.

Males are bigger and more violent than females, yet they both have amazing black and brilliant blue mottled bodies.

In A Nutshell

After referring to this article, have you grasped the basics of carnivorous freshwater aquarium fish?

Some of the most popular meat-eating creatures should mention Arowana, Red-bellied Piranha, or Pufferfish.

If you intend to keep some of these creatures in your aquarium, it’s best to learn about their behaviors in a community tank.

Always have a contingency plan to move some if there are any fights between this species and others.

Thanks for reading, and see you in the next post!

Alex is a pet freelance writer and editor with more than 10 years of experience. He attended Colorado State University, where he earned a Bachelor’s degree in Biology, which was where he first got some experience in animal nutrition. After graduating from University, Alex began sharing his knowledge as a freelance writer specializing in pets.

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