target feed him a bit, when he's hungry he will be a bit sticky. Since you have a high flow tank you could take a tupperware or glad plastic container that is cheap and cut the bottom out of it. Place this around him when you want to feed to cut down on the flow in the area around him. Use a turkey baster, eyedropper or syringe and drop some food on top of him. Things I know they like you can try. Thawed krill cut into small pieces. ZoPlan brand dried Zooplankton. Formula One Marine Pellets from Ocean Nutrition in the small pellet size. let them soak a bit in a small container of tank water before dropping them on top. maybe five minutes. Thawed mysis shrimp. Feeding response varies. You can kick up some debris or blow some stuff out of your live rock and if he tries to catch it by funneling up you can probably feed him a snack or two.
Tony
Tony