Zebra Danio (Danio rerio)

The zebra danio is an active fish that prefers to be in groups of 6 or more in a ratio of 1 male to every 2 females. It stays small at around 2'', but requires at least a 20 gallon long tank because it's such an active swimmer. This is the least expensive fish I bought, costing me less than a dollar each. Many people use zebra danios to cycle a new tank because of this, although I prefer doing a fishless cycle or getting mature media from a fellow hobbyist. Not a fussy eater at all, the zebra danio will accept most small foods. You can get fry from them by putting marbles into a bare bottom tank. The eggs will drop between the marbles out of the adults' reach. The adults can then be removed before the eggs hatch.