IM starting a new saltwater tank three days ago I set it up and put in live sand and then put in the saltwater which we got from the pet store, city water were I live is terrible. When I added the water it made the tank really cloudy like they told me at the pet store. The sand has settled and it's less milky looking but it's been cloudy the past two days and doesn't seem to be progressing. What should I do?