Ok, got a 4 ounce bottle of the 30 ppm colloidal. since I had so much, I treated the entire 30 gallon tank, using 1 tsp per 2 gallons. I still have a lot left, so hopefully the colloidal in with my water changes, with some salt dips, should *hopefully* work it's magic like it has for everyone else. I think I am going to give everyone silver water before I go away to camp, too, since from what I've read it should do more good than harm.