I have a Rescued Yellow Tang, that had HLLE, on just the Head, and rehomed a Blue Tang, that had Fin Damage. Can’t praise Selcon enough, gave me two beautiful fish. Fed the Yellow Tang, every day with Seven Drops of Selcon, on a Cube of San Francisco Bay, Saltwater Variety pack, and alternating it with Angel/Butterfly Fish Formula. When I saw improvements, went to every other day, with the Selcon, now at every Third Day. Fish, still get a Cube a Day, and they are Pigs. Keep the open Selcon in the Fridge.