clouding is strongly correlated with free ammonia/bacteria capitalize on it faster than they can attach to surfaces, excesses form briefly.
also common in cycling tanks is clouding sand that went unrinsed, and hasn't settled.
how long has the tank had water in it/post pics of the setup, we dont need to see the tests only the aquarium and know days with water. when clouding is related to free ammonia, it often smells
how does the tank smell