I am very sorry you lost all your fish but one. I am glad it didn't turn you away for them hobby, can't say the same if it happened to me. Have fun getting new ones.
I have always wondered about freshwater dips. I tried it once and it didn't work at all,(2 tangs). Mandy has tried it, (twice), and it didn't help. I cannot say I've ever heard of it helping.
Anyone?