Same here, the cloudy tanks seem to be dirty glass on the back and sides. Same with petstores alot of tanks will have a "haze" if you look through the sides of the tanks but if you look through the front they are usually clear.I personally don't believe the water is milky or cloudy. I believe the sides of the tanks have algae, etc on them. I have several new tanks set up below some "seasoned" tanks. The older tanks have a similar appearance of those in your video...the new tanks look cleaner because the glass is spotless.
I've never seen a breeders rack that is dirty or cloudy (water, not talking about glass) all the time.
Crs are not hard to breed in the overall picture, they are sensitive to a few things but if you keep things stable, set it for the right temp and keep things stable (yes stability is key) you will have babies in time. Don't worry about if your water is the right cloudiness, they are finicky at first and will take time too settle in but once they start breeding you are usually set to go as long as things stay stable.