No, the celestial pearl danio is not a schooling fish. However, it’s a social species that seeks comfort and safety in numbers, so this species still prefers living in large groups.
In the wild, celestial pearl danios live in large groups so they can more easily evade predators, find food, and breed. It’s best to keep multiple celestial pearl danios together in a tank.
Five or six celestial pearl danios are a great starting point. However, the more you can keep, the better. Just make sure to provide them with plenty of space to explore. Each celestial pearl danio requires around two gallons of swimming space as a general rule, so a small group of five celestial pearl danios will fit nicely in a 10-gallon tank.