ANSWERS: 2
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Tap water needs treating to remove the chlorine, which is poisonous to fish.
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Well for one.. 1/2 gallon or smaller is not large enough for two fish. In my world, short of a Beta or Guppy it isn't big enough for one fish. The water should have been in the tank ahead of time and filtered for a bit. When you brought the fish home, the water from the bag they were in should have been added, after it was rested in the tank water to come to the same temperature without shocking the fish. I would go into a pet store and ask for something to condition the water.
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