I will just note that each tank is a unique biological system, so even when we have several tanks and think we are doing the same in all of them, there are subtle differences biologically.
The cloudiness in the photos is likely a bacterial bloom. In general terms, these can be avoided for the most part by regular (once weekly) substantial (50-70% of the tank volume) partial water changes, vacuuming into the substrate, keeping the filter well rinsed, not overstocking, and not overfeeding. New tanks are often subject to a bacterial bloom, and I have known them last from a few days to several weeks, even longer once.
On no account use any of the "clarifiers" fish stores may try to sell you. These are harmful to fish.
