Some people feel sorry for animals in zoos and aquariums.
They think the animals miss their freedom, and worry that the creatures are depressed and deprived. Designers and researchers take great pains to build a living space that looks, feels, smells and tastes just like the habitat that the fish left. This fish doesn't have to worry where the next meal is coming from, or if it's going to be someone else's next meal. It has places to hide, free swimming space, and any predators hanging around are so well fed they're not interested in a measly little reef fish. All of its basic needs are met.