Try some mysis shrimp as well as some of the other frozen food. San Fransisco Brand makes some nice mixes such as Marine Crusine and Ocean Nutrition's formula one is also a nice food.
brine is not the best food. OK for an occasional treat, but should not be used as a staple food. It lacks the nutritional quality that other frozens may have.
Also, soak the food is a vitamin supplement such as selcon and you should have a healthy happy clown.