[header] How to choose starter fish for freshwater aquariums [title] Make sure that you've cycled your tank for at least one month. [step] Take a look at their fish species. They will have tags saying whether the fish are community fish, proceed with caution/community fish with other fast swimmers, or non community fish. 
For most aquarium owners, community fish are your best option. You will want a mix of top feeders, mid-dwelling fish, and bottom feeders.