I have a fire shrimp and three cleaner shrimps in my tank. They eat everything I put in the tank for fishes. My fire shrimp usually only comes out during feeding time. Since I use turkey baster, I just squeeze out a little bit of food in front of the shrimps and they will jump and catch the food. I would say unless you are under feeding your tank, no need to direct feed the shrimp. But if you are worry about it not getting enough food, do what I did, just put a little bit of food in front of the shrimp.