I know there is marine salt and aquarium salt as well as the Aquarium Co Op Baby Brine Shrimp Salt. I know that marine salt and aquarium salt are two different types of salt. Marine salt is used to create a salt water or brackish tank. Aquarium salt, I believe, is used more to keep the fish and tank healthy. Obviously the Aquarium Co Op Baby Brine Shrimp Salt is supposed to be used in the hatching of baby brine shrimp. I want to buy some aquarium salt to keep my tank healthy and was going to buy the Fritz Freshwater salt. The reviews are very good on their salt but wanted to get some opinions from folks on this forum. Also can you use the Aquarium Co-Op Baby Brine Shrimp salt as Marine salt as well? I currently use Instant Ocean and am almost out. I have 14 pounds of the Aquarium Co-Op Baby Brine Shrimp Salt and was curious if I could use that in place of the Instant Ocean.