I think you are actullay talking about brine shrimp cysts that most LFS sell for people to hatch. Look up instructions on the net, there are tons of them on how to hatch. After that you can feed them to your fish, but they are extrmemly small. So I'm not sure if they are even big enough for the fishes to eat when they are first hatched. Most people use these to feed baby fish and inverts.