Danios are social schooling fish that thrive best in groups. It is recommended to keep at least 5 to 6 danios together to ensure their well-being and reduce stress and aggression. Ideally, larger groups of 8 or more are beneficial, especially in adequately sized tanks like a 10-gallon or larger. Smaller groups can lead to stress and increased aggression among the fish.
Danios are generally peaceful and non-aggressive fish, especially toward other species. However, if kept in small groups or cramped tanks, they may become stressed and exhibit minor aggression such as chasing or fin nipping among themselves. Maintaining proper group sizes and tank conditions helps keep aggression levels minimal.
Danios are considered hardy and easy to care for, making them suitable for beginners. They adapt well to a range of water conditions and temperatures (approximately 18 to 25°C), have a straightforward omnivorous diet, and thrive in tanks that provide clean water, ample swimming space, and adequate schooling companions.
Standard danios do not naturally glow in the dark. However, genetically modified varieties known as GloFish Danios fluoresce under specific lighting conditions such as blue or actinic light, exhibiting bright fluorescent colours. Regular wild-type danios do not have this glowing trait.