Welcome to the forum and i'm really sorry to hear about the little one.
You could try to feed it by hand. Shut off your powerheads and return line(if you have a sump or refugium) that way the water is mostly stagnant and it'll knock some of the work for the wrasse out. See if that works better for it, if not then craddle your hand and try to keep the food in there and allow the wrasse to eat out of it. If you have other fish try to feed them first, with flow on, and then turn everything off and feed it. It may take a while and get a little frustrating, but after a few tries, the wrasse will get use to it. You could also use a container that has a small outlet, but wide enough for just the wrasse to go through (if it's one of the smaller fish in the tank) and put the food into it. Then once you're done, clean it out. You do this to make sure that the fish has a stress less situation as well as no competition with other fish or powerheads.