Remember, when setting up a new tank from scratch it's almost to completely sterile. I would say that cloudiness is normal in a tank that's being set up as it happened with mine. I run my 55 gal tank WITHOUT fish for a week (just my preference) it got cloudy on the third day but cleared up on the fifth, I did this to allow the filter remove any impurities from the water (water treated with aquasafe to neutralize
chlorine,
chloramine and heavy metals from the water). WhenI added the fish I added "Cycle" to provide the beneficial bacteria needed to start the nitrification process, which in turn
reduces the lag time required to
achieve low levels of ammonia --> nitrites --> nitrates subsequently. After a couple of days it got cloudy again which was a bacterial bloom (nitrosonomas, transform ammonia into nitrites)I didn't do a
water change and it got cleared on the next following three days. Then was just a waiting game 'til the nitrobacter bacteria appeared (transforms nitrites to nitrates) following the weekly dose on the cycle label. My tank fully cycled on exactly four weeks, then added more fish slowly to stock my tank. Ammonia readings are 0ppm, Nitrites 0ppm, Nitrates 7ppm. I also added some aquarium plants to help reduce the nitrates from the water. At first, the fish get stressed 'cause the ammonia and nitrites build-up, you should put only a couple of hardy fish for this otherwise they will die, but I'll recommend the FISHLESS CYCLE.
Hope this will help in any way and there are many articles you can read even here at Fishlore about Cycling you tank.
Later.