When I was cycling my 29 gallon it started to get cloudy after a week. I hadnt cycled a tank in YEARS, and Petsmart, where I bought my initial set up, said that I didnt need fish to cycle my tank (as I had thought you did). So after a week of "cycling" with no fish, the cloudiness set in. So I called my dad, who is some what of a aquarium expert, and he seemed disappointed that I had forgotten the biggest "DUH" of tank cycling...you cant cycle a tank without fish to create biological material! Within 24 hours of putting my Firemouth cichlids in the tank, it cleared up, and has completely cycled in just at about 5 weeks.
Anyways, my point is that you should add some hardy fish to cycle your tank with. Try and make sure you like the type of fish you get because it might make it through the cycle. If the cloudiness persists after a few days of putting a fish in there (and all your water tests come out to a normal range), consider a partial water change. If nothing else works and the issue cant be found...there is drops to de-cloud tanks.
Hope this helps some. Your tank set up looks very pretty, curious to what kind of fishies you plan on keeping in it!