The first fish to inhabit your new aquarium should be from the Damsel family. Damsel fish are very hearty and can survive the high levels of Ammonia and Nitrite when your tank is cycling.
Damsel fish are also very inexpensive.
Most Damsels cost between three to five dollars. Many fish stores will give you credit for returning your Damsels once your tank is cycled. There are hundreds of variations of this species. Chromis Damsel -Chromis lepidolepis From Hawaii, Hearty, inexpensive. Green Chromis Damsel -Chromis viridis From Hawaii, Very hearty.