Different people do different things; I have a friend who feeds in stages, he starts with frozen oyster eggs (use a syring or delivery system to squirt them across the open polyps of the animal), then does either suspended powers, or other frozen foods like frozen phytoplankton cubes, and then finally frozen brine shrimp. Just be very careful - the more "food" you put into the tank, the more likely it is that leftovers will pollute the water causing spikes in ammonia, nitrites and nitrates which can be toxic to both corals and fish. Generally its recommended that you "feed" corals sparingly as most are photosynthetic and do just fine without every being feed.