i like D& D salt but i can mix a little dirty , some time with a brown film but over all a very good salt, for fish only i would recommend Oceanic mix well pretty clean and works well in fowler and fish only systems, some of the hardcore coral guys i hear like to use the regular red sea salt , i know JW from Age Swears by it . coral life is ok takes some time to mix and isn't too bad but i rate it low.