Group of very active Zebra Danio fish

These Zebra Danios have been living in our community aquarium for several months. They are extremely active fish that spend much of the day swimming back and forth across the tank. When together, they form small schools that move quickly near the surface. They are hardy and adapt well to different aquarium conditions, so they are often recommended for community aquariums. They have always been kept in filtered water with regular changes. As we are reorganizing the aquarium to include larger species, we need to reduce the number of smaller fish.