Begin cycling your tank with AMMO flollowing the instruction on the bottle. Buy only a few inexpensive fish (3-4) at first and make sure they are hardy species. It is not uncommon to lose a few fish in the initial stages. Bacterial additions every time new fish are added will help prevent this. Buy only fish that are treated before they are purchased and are treated in the bag when you purchase them. This is a sign of a quality dealer who cares about the livestock and the customer.