I didn't see the movie, yet. I think one day what we have in aquariums may very possibly be the only fish around. So, the more we learn how to breed the rare ones, the more secure the future of their species.
Because people are uneducated, a huge share of fish prolly have sad lives. The fish of the people who come here or another forum or read books, their fish are prolly pretty happy and well cared for.
Every re landscaping or trading out ornaments is like giving the fish a new world to live in. Heavily planted tanks would be like us living in Hawaii. Mahalo E Ke Akua No Keia La