I cannot call any of those gorgeous tanks a 'community'. Yes, very many, very large, healthy looking, and very beautiful fish in large tanks, but hardly communities.
The term 'community' in ecology has a very specific meaning. I am okay relaxing it substantially in the context of aquarium keeping, but not completely. Perhaps 'group', 'crew', 'fishy denisens' or a number of other terms may be more appropriate.
Admittedly, a matter of opinion.
In my mind, a community implies combinations of members of a number of groups not present on those set-ups - A physical media (sand, gravel, etc), where benthonic organisms (macro and micro) can live, plants playing playing a role in biogeochemical processes, physical elements of decor, planktonic denisens, and of course, the fish interacting with the other members. In a crowded large tank full of beautiful fish (and nothing else), I see just that but barely (or not at all) a community.