lots of people do spot feed their candy canes, I feed my tank pretty heavy so it gets all kinds of left overs, if its billowy and happy I wouldnt worry about it. if it starts looking shrunken with the tentacles out constantly then I would consider spot feeding. if you want to spot feed it, take some flake food and powder it up relly fine then mix it into a little tank water then suck it up with a turkey baster or feeding syringe, then give a little squirt at the coral gently. wait for the tentacles to come out and spray the particles on it you will see them stick and get pulled in. mine eats just about anything that hits its tentacles. you can also just do a general particle food like zooplankton or oyster eggs.
