You can use almost any kind of salt that you wish. When you are looking for the hatched shrimp, there will still be lots of the egg cases floating around the hatching bottle. The brine shrimp are a pinkish tint in the water. If you get a bright light next to a spot on the hatchery, the shrimp will be attracted to the light and will be easier to spot. It will sort of look like a pinkish cloud unless you have a magnifying glass or very good eyesight.