I would say more than "some" of them are less than "modern". I find many of them to be less than modern.
I have to disagree with that 3rd pic in the last post being anything close to modern. The last few pics are closer to what the original poster was looking for I think although the rest of the room besides the aquarium is not really modern at all.
I studied interior design before getting into the film industry and we spent quite a long period of time studying "modern" design. That was years ago and I do not consider myself a designer anymore but I think I have a basic idea of design still
Here for example is a better idea of what a modern room would look like. You can imagine how these elements and designs can be used in an aquarium. I would say that most of the aquariums in this thread would NOT fit in this room...
