I am right there with you on this question! Except I'm feeding newly hatched brine shrimp, which, according to the directions, I'm supposed to "rinse." (Rinsing specks...) They actually go right through the coffee filter I'm using...
Basically, I am feeding the babies twice daily, and switch out the water by dumping the new shrimp into a fresh clean batch of water. Then I transfer the babies with a teaspoon into the "new" water that's full of food.