I agree with the other responses...the shrimp will eat anything they can get their little claws on! You usually don't need to directly feed them, but I enjoy watching them eat...plus, it keeps them off my corals and stealing food.
Brine shrimp isn't a great thing to feed regularly to fish. The nutritional content isn't that great...but fish do love brine shrimp! I focus my feeding around mysis shrimp and other frozen mixtures. I do use brine when getting a new fish that may be a bit of a finicky eater and use it mixed with mysis to train them over to mysis.