Good water quality, devoid of most nuisance algae.
When you start collecting LPS (large polyp stony) corals like the Candy Cane, you need to make sure calcium, alkalinity and magnesium are in line. Typically routine water changes will take care of that.
Acclimate to lighting, if you see bleaching or retracted polyps move down to acclimate to the lighting. Of course this only applies if you have the common intense lighting fixtures.
Also you can target feed the Candy Cane, meaty seafoods, very finely chopped. Mysid, clams, shrimp... will all work. You can also buy the frozen variety.
The Hydnophora will take feedings as well as the Candy Cane. The Sacrophyton needs much smaller particle foods but typically does not need target feedings in my experience.