I had one that ask for medication for sick goldfish with odd bruise on side (as describe). Thinking it's only comets and possibly wounds from breeding, I recomend salt with 2/3 of the normal dosage(to be safe, haha) and it's cheap and good, lol. But he came back, telling me they are dying after the salt treatment. ?????, So, I went over and to my horror, white spot on every single one. I hope they are not too weak to recover.