High lighting levels
High, variable and turbulent water flow
Stable water temperature - 75°F - 82°F (24°C - 28°C)
Very low levels of nitrate and phosphate - these two can really decrease the growth rates in SPS
Stable and high levels of calcium (400 - 450 ppm), magnesium and alkalinity
Proper care of Soft corals include:
Proper calcium and alkalinity maintenance. Calcium reactors and kalk reactors are great ways to take the daily maintenance out of this. Two part additives like B-ionic work well for smaller systems if you don't mind the daily routine.
Maintaining pristine water conditions is a must. Low fish levels makes this easy. Monthly water changes are a must. The more fish you have, the larger water change you need to do. I just stick with a 25% WC to stay on the safe side even though I have a relatively low fish load (11 fish in 475G system). A good protein skimmers is a must in my opinion. RO/DI water is also a must.
Move your SPS coral around your tank until you find a place where it thrives. Some like higher flow and lighting than others. Make sure they have good polyp extension.
Maintain consistent water temperature. Anything consistently above 82-83 degrees is not good for LPS corals. They thrive better at 82 or less in my opinion.
Give 'em room to grow. That 1" frag will be a an 8" wide mother colony in a few years time.
Buy corals with contrasting colors and aqua-scape with that in mind. Contrast is what makes them all look even better.
Proper lighting is a must. While it is possible to keep LPS corals alive with VHO or compact fluourscent lighting in shallow tanks, 175 watt metel halide lighting should be considered as the minimum amount of lighting in a typical 75 gallon tank.