Did you buy a new set up or an established tank? If its a new set up, you need to let the tank cycle. Pick up test kits and learn how to use them. Ask a ton of questions here. Be wary of lfs advice.
Tell us a bit more about your tank (equipment, lighting, filtration) and what you'd like to do with it. That will help get you the advice you need to get off to a good start!
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