StarrryDream...
Welcome to Aquarium Advice! You have a very pretty tank set up there and I do understand your frustration with the cloudiness. Unfortunately this is a common occurrence in newly set up tanks.
Milky cloudiness is generally the result of one of two things: 1) gravel that wasn't washed completely before it was put into the tank, or (MUCH more likely) 2) a population explosion (bloom) of bacteria.
When water leaves the treatment plant it has been treated with chlorine/chloramine to kill pathogenic bacteria and other microorganisms. When you dechlorinate it and put it in your aquarium (and toss in some nice fish waste and uneaten food bits in the gravel) the bacteria begin to recolonize the water. They do this at such a rate as to make the water appear cloudy. This is likely what you're experiencing.
Fortunately the bacteria population will eventually stabilize on its own (after a week or two) and the cloudiness will disappear. Changing your filter media can actually do more harm than good in this case because many of the necessary bacteria for the Nitrogen Cycle will colonize the filter medium (and your gravel) and if you change it then those beneficial bacteria colonies have to start all over again.
Some people have had success clearing their cloudy water by doing 10-25% water changes daily. Personally I've always just let the tank stabilize on its own but I suppose your choice will depend on how patient you are.
If you haven't already done it....you should read the Aquarium Advice article on the Nitrogen Cycle. It is really important that aquarists understand how this cycle works!! I've included a link to the article below.
http://www.aquariumadvice.com/showquestion.php?faq=2&fldAuto=21
Good luck...and again....welcome to the forum!
