An aquarium full of fish, or one with a captive reef and fish. They are both potentially beautiful.
The aquarist has acted absolutely correctly, allowing the aquarium to mature and adapt to the increasing bio-load by introducing fish very slowly. The research showed that more timid fish should be introduced first, and thus those fish can settle in and feel secure before more boisterous fish arrive. There aren’t any particularly belligerent fish, and certainly no fish predators, in the final fish mix. None are oversized for the physical size of the tank or the net gallonage.