Congratulations on your new tank!
What exactly did you add to the water? I suggest dechlorinator and aquarium salt (a tablespoon per 5 gallons). What is in the tank exactly? Could the water be milky from say unwashed gravel, rocks, driftwood, used ornaments, or something else? Your pH is above neutral but it's not high enough to worry about. I suggest testing the hardness and alkalinity. Often, if they are high, there may be minerals in the water which can also cloud the water. Since your pH isn't that high, that doesn't seem too likely though. Minerals can come from the tap water (test that for comparison) or from rocks or other things in the tank.
How long has the tank been set up? If it's been at least a few days, and the water was clear at first, the milky color may be due to a bacterial bloom. If you have no ammonia or nitrite, then it would seem the tank is cycled unless it's just too new for those chemicals to have added up. In new tanks, often good bacteria will bloom (grow) in the water column as well as any biological filter material. In those cases, it should clear up once the biological filter material is fully colonized with good bacteria. You can help it along by adding good bacteria. I have a tiny section on cloudy water at
http://www.fishpondinfo.com/plants/algaeinfo.htm#cloudy