Animals generally live based on instinct and “survival of the fittest” and fish are not left out.
Fish aggression is a trend that has been in existence throughout the evolution of fish species. This trend can develop even among the most peaceful fish species as living conditions could dictate the behavior of fish in an aquarium in order to survive.
Factors such as lack of food, harsh environments, or defense of a fish’s territory could give rise to aggressors in a freshwater aquarium.
Fish watching can be an amazing, relaxing experience. It is calming watching the natural serenity of the fish as they swim through the aquarium water. However, the calmness the scenery brings can quickly change when you notice one fish turn against another.
Here we take a look at aquarium freshwater aggressors – those fish that are well suited to live in an aquatic community but could misbehave on some occasions.
Also known as Siamese fighting fish, the bettas live very well in a community. However, you must not keep more than one per aquarium as the males engage in vicious fights – to defend territories. Although females fight each other, this is not too common.
In fact, males could be very aggressive on females who are not willing to breed. Betta Splendens reportedly pick on fish of similar color and since they are territorial species, it is best to avoid mixing them up with species that are so concerned about territory defense such as the gourami.
As stated above, the Blue Gourami are territorial – claiming a section of the aquarium, usually towards the edge of some plants – and defending it. This is hardly a cause for concern as they are usually tolerant of other fish in the community so keeping only one gourami would help everyone in the community get along just fine. Similar to the betta species, they see each other as competitors for mates and territory of there is more than one gourami in a tank.
The angelfish mix very well in a community freshwater fish tank – so long as they are not mixed with fish that will nip their delicate fins. However, as cichlids, they are territorial. They become really protective of their territory especially with other angelfish in the tank – with some fellows in the community being bullied away from food.
It is always a visually pleasing experience to watch the breeding of two angelfish in the tank. If this is the case in your aquarium, it may be ideal to move other angelfish away from the tank – into another aquarium – to allow the breeding pair some space.
Finally, it is always important to research the compatibility of species you wish to add to your tank before you make the purchase – know what the fish would eat, its aggression level, and whether it is a gracious community fish or a territorial loner. With proper care, it is possible to keep aquarium freshwater fish aggressors happy – along with the rest of the community.