With the large polyp corals you can take a liter soda bottle and cut it in half, place a very small portion of the food in the tank, wait 20 minutes until the corals open as a feeding response and then place the 1/2 liter bottle over a coral such as a fungia, tachy, dendrophyllia, add remaining food slurring to the container.
If you do not have shrimp or hermit crabs that will steal food from LPS then you can also just turn off the pumps and place (use a turkey baster) chopped meaty sea foods on the coral, give them 15-20 minutes and then turn pumps back on.
A non photosynthetic sea fan or slash gorgonian needs particle within the water column, turning off pumps while you feed these corals is probably optimal.