Several african cichlid tanks and several saltwater tanks.
Patience. Monitor your tank daily.
Various LPS and soft corals.
Cultivating a thriving reef tank can be a challenge with all of the requirements you must meet.
Trends in the aquarium trade have an effect on more than just aquarium hobbyists -- they can affect the whole world.
The pet trade gets a bad rap for exploiting wild animals but sometimes the opposite is true.