Hello every one, i was wondering what kind of salt is everyone using on there tanks? The reason why im asking is because i want to change my salt. at the moment i have been using a salt that my buddy of mine gave which he didnt tell me what it was but it was a white box that was rated up to 160G. The salt that i have been using hasnt been giving any good salinity ppt results every time i use it on my tank. if i change to another salt brand while there be any effect on my parameters? Also how many cups should i do to make saltwater for a 55G and a 5G?