Here are 2 'interesting' articles - showing where society may be going over the next several years concerning the aquarium hobby. I don't agree with the premises here - but it is interesting to see what 'some' are thinking.
https://www.peta.org/issues/companion-animal-issues/companion-animals-factsheets/fish-tanks-thanks/
https://www.peta.org/living/companion-animals/9-reasons-fish-sad-pets/
PETA should stick to hot naked chicks in the street protesting.
Maybe my peacock mantis is sad in his 90 gal lps reef, but he’s awfully happy when I drop a baby yellow tang in for him to play with. (Jk, he’s only eaten 1 tang and he kinda deserved it for hanging out by the mantis burrow.)

