Actually fish arent like humans. If they are in a small tank, they will have health problems and they will be dwarfs also they will live less. I think a 125 gal is min. for a hippo tang. 75 can be ok for a yellow tang (i prefer 100gal). Also gobies are terrotorial fish, that much goby in a 75 is too much, they will fight all they long after few months. Maybe a firefish (swimmer), a watchman (sand) and a clown goby (in corals) be ok beacuse they all live at different parts of the tank but he or she has a lot of gobies. Pods are gonna finish because of the crowd and mandarin wont be able to eat food,
"Also i m not someone who wouldnt put a human in a 4' foot to make him live there forever just because he or she is beautiful, would you?"