I feed our wall hammer mysis shrimp and brine shrimp. The long tentacles are sweeper tentacles, which are not required to be out for feeding. In the 6 weeks we've had our hammer, I've never seen its sweeper tentacles. The ends of hammer "polyps" (? -- if that's the correct term) are sticky and will catch food. Once a piece of food has stuck to it, that individual polyp will slowly retract, taking the food down to the mouth. I use a turkey baster to direct food at our hammer.