Fish

The fish you choose ultimately dictate your entire aquarium setup, and for most of us, they’re the reason we get into the hobby in the first place. They bring vibrance, life, and activity to your tank, and choosing them is often the most exciting step-but it’s also one that requires careful thought. You need to ensure you can provide adequate swimming space, a natural landscape for them to feel at home, and the right food and water parameters for them to thrive. Consider their full adult size and lifespan so you don’t end up with fish that outgrow your tank, and keep stocking levels in mind to avoid overcrowding. While most species are peaceful and can coexist, some - like Oscars - can be aggressive, so always check compatibility before adding new tank mates. Healthy, well-matched fish live longer, avoid stress and disease, and allow you to enjoy a thriving aquarium. Use our fish database to learn what each species requires and make sure you’ve got the perfect aquarium for them.