Completely normal. Adding food to the water induces the feeding responses.
If you want to feed them you can get a 20oz bottle, cut the bottom off, put it over the coral and feed through the bottle. Just don't over do it to avoid nutrient issues.
If you want to feed them you can get a 20oz bottle, cut the bottom off, put it over the coral and feed through the bottle. Just don't over do it to avoid nutrient issues.