10 Semi-aggressive Freshwater Fish for Fish Aquarium

Human loves to watch animal fight but when it comes to our tank, they won’t want their beautiful companions to fight. Today, we share 10 semi-aggressive freshwater fish for fish aquarium. The term “aggression” is clearly misunderstood here.

The word, “Aggression” here is not about the fish’s raptorial nature and the size of the fish. Even a small fish can be quite aggressive and some big fishes are peaceful. Fish of quarrel nature do bully other fish and are territorial. They do not need to view other small fishes as food.

We are here to share some valuable facts about semi-aggressive fish and how to take care of them, so you can decide what will be the right combination of species in order to maintain a healthy environment in your fish tank.

Top 10 semi-aggressive freshwater fish

What are semi-aggressive fish?

Semi-aggressive are the fish that became aggressive only under some specific conditions, otherwise, they behave peacefully in their community. These kinds of fish do not let their owner know what they are about to do. We can observe them via their behavior changes, and as soon they get aggressive they attack the other fish or steal their food or start chasing.

There is another word, “Territorial Fish”, which also denotes the semi-aggressive fish. Such imperial-minded fish do not let other fish swim or eat in their area.

These activities create stress on the other fish and can lead to serious health problems or death. The rule of thumb to keep a fish healthy is to avoid stress. So, let’s check out how to take care of these semi-aggressive fish.

10 semi-aggressive freshwater fish for fish aquariums

Now let us know about the species of semi-aggressive fish. The 10 semi-aggressive freshwater fish for fish aquarium are as follows:

1. Angelfish

Lifespan

8-10 years

Angelfish Profiles

Angelfish

Size

5-6 inches

Diet

Omnivores

Minimum tank size

55 gallons

Water temperature

78°- 84° F

Angelfish are known for their colorful unique shape. Angelfish are basically calm but have semi-aggression behavior.

They loved to swim in the fresh water and also love to eat fish of a smaller size.

2. Severums

Lifespan

8-10 years

Severums

Size

6-7 inches

Diet

Omnivores

Minimum tank size

55 gallons

Water temperature

77°- 82° F

Severums belong to the cichlid family, which is known for their aggressive behavior. If once severums did not like their companion in their fish tank then they will start bullying, chasing them until they are damaged physically.

We have to keep an eye over the tank if we put another fish with them, or it will be better if we put a net to separate them or house them alone.

3. Afer Knife

Lifespan

12-15 years

Afer Knife

Size

20-24 inches

Diet

Carnivores

Minimum tank size

100 gallons

Water temperature

75°- 80° F

Afer Knife has beautiful marks on its body and is widely known for its shape. They are a slow grower and attains their full height after 6-8 years.

They did not hurt their tank mates. We should carefully choose their mate of larger size because they behave aggressively sometimes.

4. Gouramis

Lifespan

3-5 years

Gouramis

Size

3-12 inches

Diet

Omnivores

Minimum tank size

55 gallons

Water temperature

75°- 80° F

Gouramis are small fish and originated from Asia. They have a special ability to breathe at the surface of the water among the semi-aggressive species.

The fish with long fins or larger fins should be delisted to be gouramis mate. Gouramis start fin-nipping or sometimes damaged their body parts.

5. Plecos

Lifespan

10-15 years

Plecos

Size

12-15 inches

Diet

Omnivores

Minimum tank size

80 gallons

Water temperature

72°- 78° F

Plecos (Plecostomus) are also known as tank cleaners. They feed on algae and they are very peaceful. But sometimes gets aggressive towards the same species.

Although they look unique because of patterns over their body and we should avoid placing two plecos together.

6. Jewel Cichlid

Lifespan

5 years or longer

Jewel Cichlid

Size

1-5.5 inches

Diet

Omnivores

Minimum tank size

30 gallons

Water temperature

70°- 74° F

Jewel Cichlid is of smaller size with a colorful look. As they belong to the Cichlid family, they behave dangerously once they get aggressive. They chase, nip fins, and continue attacks until their needs are met.

7. Bichir

Lifespan

12-15 years

Bichir

Size

34-38 inches

Diet

Carnivores

Minimum tank size

90 gallons

Water temperature

75°- 82° F

Bichir has multiple dorsal fins and looks similar to eels by body shape. They are fully carnivorous. Attack over small fishes for food, and also behave aggressively sometimes.

8. African Leaf Fish

Lifespan

8-10 years

African Leaf Fish

Size

5-7 inches

Diet

Carnivores

Minimum tank size

30 gallons

Water temperature

78°- 89° F

As its name describes that these species have a special ability to hide behind leafy plants with their camouflage and hunt small fishes. If we give random looks, they look like a dead leaf.

They got unique characteristics and have originated in Africa. They often become aggressive while hunting.

9. Black Wolf Fish

Lifespan

5-7 years

Black Wolf Fish

Size

14-16 inches

Diet

Carnivores

Minimum tank size

120 gallons

Water temperature

75°- 82° F

Black wolf fish are known for their look, as their teeth are coming out of their mouth even their lips are shut that giving a wild look. They originated in South America. They can be very aggressive if provoked.

10. Dwarf Pea Puffer

Lifespan

3-5 years

Dwarf Pea Puffer

Size

1-2 inches

Diet

Carnivores

Minimum tank size

10 gallons

Water temperature

77°- 79° F

Dwarf Pea Puffers are very small in size and have yellow with black spots. They are territorial and become aggressive and resulting in a fight with any species.

They give pleasure to watching but they want free space to swim and food in their area.

How to take care of semi-aggressive fish

There are multiple ways that help to keep our semi-aggressive fish calm and peaceful nature. In case, your aggressive fish became a danger to the other fish, then you should immediately isolate or separate them. Some minor acts of rules will reduce the chances for the bully fish for being aggressive. Let us understand the valuable points as follows:

1. Getting a bigger aquarium

The aggressiveness came up as the cause of territorial attitude which somehow is reduced if we increase the fish tank size. As then will get free space to swim.

Well, the gallons of water required is different according to the species, but for a sake of convenience, about 50 gallon fish tank is suitable to put any aggressive with other fish.

2. Adding more decors for the hiding spot

Some fish are very peaceful and lives in themselves only, but they are easily bullied by the aggressor. Thus, the decor or hiding spots should be added like a hollow tree trunk, cave-like structure, or tall plants to swim around. These extra hiding spots would feel safe from the aggressive fish.

3. Rearrange the tank decorations

When a semi-aggressive fish becomes imperial-minded then they hate if other fish enters for swimming or eating. But if we suddenly change the order or place of every decoration and extra equipment in the tank then the fish will get confused that they are in some other territory, and thus this effect will change their behavior and keep them calm & peaceful.

You can change the fish tank decorations positions, can add different plants, and many more, but make sure that you turn the lights off so they cannot notice making changes.

4. Isolate for a short time

In starting days the semi-aggressive fish didn’t like the presence of other fish. If we isolate them for a week in a cubical-shaped plastic bar and hang them in a corner of the tank, then they can smell their presence and also eats with them. This process makes them very used to the other fish.

5. Proper care of their diet and environment

We should change the water regularly and also clean the waste on a regular routine basis. Change the filter with the time and keeps the environment clean, so they did not come with the stress.
Semi-aggressive are known as good swimmers, so it’s also important to take care of the diet plan and add some protein food as they need a healthy diet.

What if, your semi-aggressive become more dangerous and started bullying or damaging little fish or other species of the same size? It will be better to separate them by putting them in different aquariums.

Conclusion

Hope you learned about semi-aggressive fish and how to control them. Now you can add semi-aggressive fish but make sure you have knowledge about their behavior. May your all queries through this article regarding “10 Semi-aggressive Freshwater Fish for Fish Aquariums” are answered and help you to decide which is best for your aquarium. If you have any unanswered questions or want suggestions for the products for your aquarium then please leave your message in the comment section.

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