Hi, Recently a lot of people have been asking about salt and which salt is okay to use when they have a sick fish and have been recommended to use the medicinal dose of .3%. Here is a summary -I have collected this data from various sources including online and books. If this info is somewhere else then sorry, but I couldn't find it in a concise post with an explanatory reference title. It is possible to use many kinds of salt in the aquarium. In fact even some table salts may be safe, contra