Cube Tank. Jebo cube.
Research, and research more before picking fish. Then research more before choosing. Be prepared for everything possible before you create a home for them.
In the cube tank - Dwarf Puffers and bumblebee gobies. Had a Chinese River Goby but he mysteriously disappeared after 6 months of being in the tank.
The pet trade gets a bad rap for exploiting wild animals but sometimes the opposite is true.
Modern advances in technology affect every industry - even the aquarium hobby.
If you are looking for a unique invertebrate to add to your saltwater tank, consider the sea urchin.