Aggressive Fish: What You Need to Know

The picture of an aquarium is usually one that is serene with fish moving around slowly. Well, some of us love some action in our aquariums, which requires you to have some aggressive freshwater species in the tank. You need to stick to one rule though, when introducing the aggressive fish, you need to make sure that they are compatible with existing species. Let’s have a look at the options you have.

Siamese Fighting Fish

Male Siamese fighting fish are aggressive, especially when two male species are put in the same aquarium. They will most likely fight to their death in such a situation. This is natural to them, because they use this aggressiveness to establish territories for mating and feeding. Female Siamese fighting fish don’t do this, they can live communally.

You can place male Siamese fighting fish in a tank with other species, but you have to take great care. If the other species have similar appearance to the fighting fish or if the tank is too small, then fights could occur, which can be detrimental for the other non-aggressive species.

Red Bellied Piranha

No fish species can get more aggressive than the red-bellied piranha. However, this fish can stay communally with its own species. Woe unto you if you introduce a different species, you will have created a meal for them.

These fish can grow to up to 12 inches long, and will feed on fish species that are smaller. So, to avoid losses and seeing your favorite fish torn to pieces, don’t incorporate this piranha species into an aquarium having other species.

Paradise Fish

Similar to Siamese fighting fish, the female species of the paradise fish don’t display any aggressiveness. Males can be aggressive, but this is mainly to establish a pecking order in the aquarium. Once this is established, then the fish tend to be less aggressive.


The name shouldn’t fool you – these fish are beautiful, yes, but as aggressive as they come. These fish are choosy, and will coexist with tetras quite well, but get aggressive when you introduce guppies into the tank.

Angelfish also tend to pierce smaller fish to death, which makes it wise to avoid adding smaller fish to a tank containing angelfish.  If you wish to add other species to a tank containing angelfish, make sure to do this when you have fed the angelfish and when it is dark.

Either way, you need to keep the aquarium clean for whatever species you choose. Here are tips to do this:

Always use a good cleaning brush to clean the filter and the tank itself. Clean the filter because it eliminates the bacteria that have settled on it. If you own a bigger tank, get a bigger brush. You also need to clean the gravel present in the aquarium. Doing this removes any waste present in the gravel.

At times, algae can be stuck to the glass. Use a scraper to remove this algae from the glass. Don’t use a razor due to the harshness that can cause scratches.

Final Words

Well, a serene aquarium can be a great addition to any home, but an aquarium with aggressive fish makes everything faster. This is reason enough to add some aggressive fish to your aquarium. However, make sure you understand how the aggressive fish behave before buying some. Start your hobby of keeping aggressive fish by visiting Come into the Water today.

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