While it’s generally recommended for Celestial Pearl Danios to be kept in a 10-gallon tank or larger, a 5-gallon tank can hold a small group of these diminutive darlings. You can comfortably house three to five of these danios in a 5-gallon tank, taking care not to overcrowd their dwelling space.
To make their living quarters comfortable and homely, include vegetation, hiding spots, and maintain optimal water parameters. However, If you plan on introducing additional tankmates, it’s wise to consider upgrading to a larger aquarium to prevent potential stress and territorial disputes.