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http://www.aquariumadvice.com/artic...g-but-I-already-have-fish-What-now/Page2.html
This will explain what you need to do. Daily or even twice daily water changes need to be done. You need to purchase a test kit (I would recommend the API freshwater master test kit, has all the test you need to cycle a tank) and a good dechlorinator (prime is what most use).