I suspect the cloudiness is a bacterial bloom.  That happens when the tank cycles.  The fish produce ammonia, which gets eaten by bacteria.  In the initial stages, the bacteria get out of control and cloud up the water.  I would recommend changing about 25% of the water every day until it clears up.

That will make your fish much happier, too.  Once the tank it cycled, you can back off to about 10% water changes per week, or less often, depending on how big the tank is and how many fish you have.