Stop pumps/ powerheads and target feed if you want, or you can do anyway you feel works best for your tank. I feed little something every other day. One day a week I turn off all pumps and target feed. Other days I just turn off the return off and leave the powerheads on to circulate the foods. From what Ive read most filter feeders are more actively looking for food at night so I normally try and feed at least once a week when the lights have been off for a while or feed in the early morning before leaving for work. A timer or controller makes it a little easier to feed later at night or morning when Im headed out the door shortly there after. I alternate ReefRoids, BRS Reef Chili, and Coral Dust- Zoa/Ricordea food.
Like everyone has said, start slow and keep a check on the nitrate and phosphate levels, if levels start to rise take a break from the feeding for a few days since the uneaten food to breakdown and impact these levels. If you notice detritus buildup piling up around rock bases try to increase the flow or direction and feed a smaller amount of the food at a time.
Larger corals, like Acans, Euphyllia, Lobos, and including Anemones I try to use a chunkier food like the frozen krill, shrimp, marine cuisine, or the like. If you have clowns hosted by the anemone they will normally feed it for you from what Ive ever seen. Kind of like you'd pay a body guard, protect me and Ill feed (pay) you.
Fed RR for years and no harm that I could pin down to Euphyllia has occurred.