I am familure with it but dont use it . I would recommend that anything you dose you test for . But with regular water changes you should not need that ..As I said earlier they also have other elements in them so watch for ODs . Ie I used purple up and had dosed iodide and ODed the tank on iodine as purple up contains iodine as well. So know what is in it , ususally the suppliments are made to take the place of several .