Additional information (Wiki):

Zebrafish are hardy fish and considered good for beginner aquarists. Their ease of keeping and breeding, beauty, price, playful nature and broad availability all contribute to their popularity. They thrive best in 22–27 °C (72–81 °F) water. They need an aquarium of 10 gallons or more, and they do well in schools.They also thrive as shoals of six or more, and interact well with other fish types in the aquarium. However, they are susceptible to Oodinium, or Velvet disease, Microsporidia (Pseudoloma neurophilia), and mycobacterium species. Given the opportunity, adults eat hatchlings, which may be protected by separating the two groups with a net, breeding box or separate tank.