Coral has its own dips---Revive and Coral RX among them. They mean do not use these drugs on a coral.
Personally, I don't medicate a well fish. Just observe. Others with species more prone to certain ills use Paraguard, etc. Some go so far as Cupramine, but not all species tolerate it well, and it is a poison: to use any med, you need to closely monitor water level as evaporation may concentrate the med above safe levels.