In this guide, we’ll cover what you need to know when it comes to choosing the best freshwater aquarium fish. Our focus is on freshwater aquariums since they are generally easier to maintain than saltwater aquariums and make a great choice for beginners.

HOW TO SELECT THE BEST FRESHWATER AQUARIUM FISH

1. COMPATIBILITY

Compatibility refers to the ability of different fish species to coexist in the same tank without aggression, stress, or harm to one another. It is essential to research the fish’s social behavior, size, and temperament to be sure you’re choosing the right tank mates–species that will get along with other fish in your tank. Some fish are peaceful and can live harmoniously with others, while others are territorial and aggressive, requiring their own space. 

As you select fish, choose those that share similar environmental needs, social behavior, and dietary requirements. This is essential to promoting a healthy and thriving community in your aquarium. Failure to consider compatibility can lead to stress, unhealthy fish, fights, and even the death of your fish.

2. SIZE OF THE FISH

One of the most important factors to consider when choosing fish for your aquarium is the size of the fish. Be sure to consider the adult size of the fish, as it will need enough space to swim freely without being cramped.

Be sure your tank size is appropriate for the size and number of fish you want to keep. Keeping fish that are too large for your tank or overcrowding your fish can lead to poor water quality, stunted growth, and even premature death. 

And, perhaps surprisingly, keeping a fish that is too small for your tank can be dangerous as well. A small fish can get stuck in decorations or sucked up by the filter. So, make sure your aquarium, decorations, and equipment are suited to your fish’s size.

3. LIFESPAN OF THE FISH

Your fish will have have varying lifespans depending on their species, so you’ll want to research their longevity before making a decision.

Some, like goldfish, can live for decades when given proper care and a suitable environment. Others, like tetras and guppies, have much shorter lifespans, typically only a few years. It is important to note that the lifespan of your fish will also be affected by the conditions of the aquarium, such as water quality, temperature, and the presence of other fish.

Choosing fish with longer lifespans can provide more enjoyment and satisfaction over time, as they will be around for years. It also reduces the need to constantly replace fish, which can be stressful for the fish and the aquarium owner.

And, just as with other pets, some fish require specialized care and more attention to live a long life, so consider the level of commitment required before bringing them into your home.

Choosing the best freshwater aquarium fish is a crucial aspect of setting up and enjoying your aquarium and should not be taken lightly. By researching and understanding the needs of the fish you wish to keep, you can create a balanced and harmonious ecosystem that promotes the well-being of all your aquatic pets.