Given their schooling nature, a school of 6-8 Celestial Pearl Danios is considered the bare minimum to keep these mesmerizing creatures happy and vibrant. They are best seen mid-water in such coherent groups, displaying their ethereal beauty at its best!
Remember, they revel in each other’s company, and larger groups help disperse any minor aggression that may come up, especially during breeding. Hence, keeping them in bigger groups can contribute to a healthier, happier celestial society if your tank size allows.