They will spit it back, some time later. And look after that, as they had hangover.
You may feed smaller doses, every day. You can estimate the "stomach" volume by the size of the polyp. It should recover in a months, at least partially.
My lemon yellow sun coral (T. aurea?) has peculiar requirement: at beginning it couldn't tolerate the homemade sea food blend, that is used by pale orange-pink sun (T. faulkneri?). But feeding the whole food, like mysis, Ocean Plankton, Pacific plankton, some brine shrimp for a taste, worked well.
Maybe try the frozen crustaceans from LFS?