Nano tanks are a popular choice for aquarists looking to add beauty to smaller spaces. While they offer convenience and charm, not all fish are suited to these compact environments. Some small species thrive in nano tanks, showing vibrant colors and active behavior, while others suffer due to space and social needs. It’s important to know which fish will adapt well and which should be left for larger tanks. Let’s find ideal species for nano setups—and a few that are best avoided for their own wellbeing.
1. Chili Rasboras
Chili Rasboras are a top pick for nano tanks due to their tiny size and peaceful nature. Reaching only about 0.7 inches long, they thrive in planted environments with soft, acidic water. Their vivid red hue stands out beautifully in compact aquariums, especially when kept in groups. Additionally, their low bioload makes maintenance easier. They’re shy but active, especially when provided with hiding spots and gentle filtration. Because of their social needs, they do best in small schools, enhancing their health and color vibrancy.
2. Ember Tetras
Ember Tetras add a brilliant orange flash to any nano tank. They’re peaceful, community-friendly fish that flourish in groups of at least six, and they only grow to about 0.8 inches. These fish are highly adaptable and do well in tanks as small as 5 gallons, especially when filled with live plants. Moreover, their calm demeanor helps reduce stress for both themselves and tankmates. They prefer soft, slightly acidic water and enjoy swimming in the mid to upper areas of the tank, making them both low-maintenance and visually pleasing
3. Endler’s Livebearers
Endler’s Livebearers are colorful, energetic fish that adapt well to nano tank life. Growing to about 1 inch, they’re hardy and can tolerate a range of water parameters, which makes them ideal for beginners. Plus, their lively swimming and dazzling color patterns add charm to any small aquarium. Like guppies, they breed readily, so keeping an eye on population control is important. Because of their constant movement, it’s best to provide plenty of space and hiding areas—even in small setups—to prevent stress and overcrowding.
4. Pygmy Corydoras
Pygmy Corydoras are peaceful bottom-dwellers that thrive in nano tanks with soft, sandy substrates. Measuring just under 1 inch, they’re social fish that prefer to live in groups of six or more. Not only do they help clean up uneaten food, but they also add entertaining behavior to the tank as they scurry and swim in shoals. Despite their small size, they still need open space to swim horizontally. Therefore, a longer tank layout is ideal. Keep the water clean and provide hiding spots for these shy yet hardy fish.
5. Scarlet Badis
The Scarlet Badis is a vibrant nano fish known for its intense colors and shy personality. Males reach just under an inch, making them suitable for tanks as small as 5 gallons. However, they are territorial, so it’s best to keep one male per tank unless it’s larger and well-scaped. Furthermore, they prefer live or frozen foods, which requires a bit more care. They thrive in heavily planted environments with gentle filtration and stable water conditions, making them perfect for experienced aquarists seeking a vivid centerpiece.
3 Fish That Never Should Be In Nano Tanks
Let’s be real — nano tanks are super cute and easy to fit just about anywhere, but not every fish is cut out for tiny living. Some species need way more space than these little setups can offer, no matter how cool they look swimming around in them. In this quick guide, we’re diving into three popular fish that absolutely should not be in nano tanks — for their health and happiness, and your sanity too. Let’s save you some trouble (and save the fish some stress).
1. Goldfish
Despite being a common beginner fish, goldfish are not suitable for nano tanks. They can grow over 6 inches and produce a significant amount of waste, requiring strong filtration and plenty of swimming space. Even fancy goldfish need at least 20 gallons per fish. As a result, placing them in small tanks leads to stunted growth and poor health. Additionally, they are social creatures that prefer company and constant movement. A nano tank simply can’t meet their environmental or biological needs, making it an unsuitable choice for their care.
2. Angelfish
Angelfish may start small, but they quickly outgrow nano tank conditions. These semi-aggressive fish grow up to 6 inches tall, and their territorial behavior increases with limited space. Their tall fins and graceful swimming require vertical room and a tank of at least 20 gallons. A nano tank stunts their growth and leads to stress or aggression. While they’re a popular centerpiece in larger aquariums, confining them to small spaces causes harm. Ultimately, angelfish needs a more expansive, well-structured environment to stay healthy.
3. Bala Sharks
Bala Sharks are often mistaken for nano-friendly fish when they’re juveniles, but this couldn’t be further from the truth. These fast-growing, active fish can reach up to 12 inches and require plenty of swimming space, ideally in schools. Furthermore, they’re skittish and need a calm, large environment to reduce stress. Placing them in a nano tank leads to poor health and erratic behavior. They also jump frequently, needing secure tank lids and wide open areas. In short, they are far too large and active for compact setups.
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