Am I weird that I like the female's markings better?Both stunning fish to see, though. I loved the video!
I like the males "mean" colors more but other than that I like the females better. The contrast is much better.
As for the tank.... I really like it. Sure it doesn't look like some beautiful SPS reef, but the fish are the stars of that tank. They are always in view and it is designed around them. What do you want in the tank rock? It is dimly lit for the fish, so it wouldn't be a good tank for photosynthetic coral, and rock would make it more difficult to clean and if you notice there is low flow in the tank, so waste would collect around the rock. Those fake plants, that aren't so gaudy anymore because they are covered with algae, are easy to move for cleaning. With a tank like that the fish are doing very well. They don't need a spotless display and the way it is designed it is easy to take care of.
As for the comment on the most expensive fish being in a 75 gallon, what size tank do you want it in? The bellus pair you mentioned get larger than a peppermint angel. So two bigger fish are different than one smaller fish. I also think 75 gallons is plenty for a single Paracentropyge. Also that fish has been doing very well and it is the only one in captivity so I think 75 gallons is okay. As for the bellus pair in a 120, SDguy has his awesome Genicanthus pair in a 110 so you can decide if you want a pair in a 120....