You can refer to this guide as a general reference. Part 2 will be published this week.
Corals need cool water in the 26-28Deg C (in general). Corals also don't like drastic temperature or water parameter fluctuations. Ideally you have a small chiller. Depending on where the tanks is located, some can get away with a cooling fan, but take note you will have a tremendous amount of evaporation which is troublesome to manage.
Corals need nutrients in the water to survive. Part of it comes naturally from fish poop/waste. So if only have corals with no live stock, you need to supplement this manually