African Cichlid fish tank loaded with peacocks - wall aquarium by Aqua Creations

The question “Is there a rule of number of fish allowed in an aquarium?” is often asked by both novice and seasoned aquarium enthusiasts. The answer, however, isn’t straightforward. While there is no rigid rule, a general guideline often mentioned is ‘one inch of fish per gallon of water’. Yet, this measure is far from foolproof and must be considered alongside other factors such as the fish species, size, and personality traits. For instance, some species of fish are more territorial than others and may require more space. The fish count in an aquarium, therefore, largely depends on a combination of these factors..


It is recommended that you research the fish type before making any purchase to ensure compatibility with existing tankmates. Sometimes overloading is recommended so that it will reduce aggression from territorial species such as peacocks.

In conclusion, there is no hard and fast rule to determine the number of fish in an aquarium. The final decision should be based on a combination of factors, with careful research done beforehand. This way, you can ensure that your tank is properly stocked with compatible fish types for a thriving aquatic environment. It will take intuition and discernment to make the best decision for your aquarium.

Remember that even if you make an informed decision, you’ll need to keep a close eye on your aquatic environment. Watch out for signs of stress or aggression in fish, and adjust stocking levels as necessary. With proper care and maintenance, your aquascape can be a vibrant and thriving space for aquatic life.

It is also important to remember that the fish count may change over time. As your fish grow, they will need more space and will produce a heavier bioload that the system will need to handle.


When in doubt, talk to a trusted expert.

At Aqua Creations, we specialize in custom fish tanks and can help you create a safe environment for your aquatic friends. Our team of professionals will provide personalized advice and assistance to ensure that your tank is well maintained and properly stocked. Get in touch with us today to find out more.