To help us suggest suitable fish, can you tell us your water parameters of the tap water? GH (general hardness), KH (carbonate hardness or Alkalinity) and pH. You can get these numbers from the municipal water supply folks, probably on their website.
It is much easier selecting fish that will be at their best in your water parameters, rather than trying to adjust the water which while it can be done is not always easy or inexpensive.
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