Here is my simple and best advice, hopefully will give you a headstart in the hobby...
1. Understand and test frequently for the following:
a. Alkalinity
b. Calcium
c. Magnesium
2. Keep alk, ca, and mag consistent as you can, understand how much your tank consumes daily, automate with a CA Reactor, or 2 part, which ever you decide, try and automate or dose throughout the day to keep these params from a major swing...
3. Try and keep your temperature from swinging too much from lights on to lights off
4. Experiment and/or study each coral you buy and place where the coral will be happiest based on your desired lighting.
5. Provide plenty of flow, and plan for the corals to grow and have a plan on upping the flow as the corals grow.
6. Have a nutrient good nutrient export plan in mind, heavy skimming is usually advised with sps corals as they need clean water to maintain color.
7. Automate top-off to avoid any swings in salinity, make sure the tds of the water going in to the tank does not have any tds higher than ZERO.
8. Dip and QT new corals as best as you can before going into the display..
Good luck, just some thoughts I thought I might share, most already mentioned...good luck on your sps journey
