Natural Zebra Danios (Danio rerio) are white or silver in color with dark horizontal stripes covering the fish. This is one of the most popular small aquarium fish available and are perfect for small or large community and planted aquariums. This fish is even popular amongst scientists who breed them for genetics and other research**.
Many tropical community aquariums are populated with tetras, rasboras and other similar schooling fish. Though these fish are rather small, their pleasant temperaments, the schooling behaviors they exhibit and a vast variety of colors and shapes make them popular in the hobby. They can grow anywhere from a few centimeters to a few inches, and can add movement to a freshwater fish tank. Most of these fish are fairly easy to care for and have similar water chemistry and care requirements.
Danios are commonly recommended as “starter fish” and dither fish. They are fast and active swimmers and they like a long tank to swim in. Danios have interesting markings and are generally hardy and peaceful.
These fish prefer aquariums with plenty plants and ornamentation to explore, but also need plenty of open space to swim. They can be fed commercial flakes, granules and small pellets as a staple diet, with occasional feedings of meaty frozen or freeze dried treats such as bloodworms, plankton, mysis or brine shrimp. They prefer to be kept in groups of six or more to school and feel secure. Fish not kept in proper schools may be stressed and remain hidden or may become extremely nippy and aggressive.
Danios are definitely an active schooling fish. I've had them in all my tanks in schools. They're supposed to be peaceful fish, but I've actually witnessed the females chased the smaller males, attack them and kill them. Therefore, I'm not so sure I'll buy them in the future. They don't harm other fish and, though, they're labeled as upper swimmers, mine always swam all over the tank.