Bath treatments are disease treatments that originated since the earliest days of goldfish culture. They are easy to carry out. One of the most effective procedure is called the salt bath which is quite effective in eradicating ciliated parasites from the fish. However, there are also useless, thus not recommended, bath treatments such as the use of certain antibiotics or vitamins in the bath.
Bath treatment can either be short-term (a "dip") or long-term (from a few hours to 12 or 24 hours or longer).
Salt: the most effective bath treatment, and is used to eliminate ciliatedprotozoanparasites (including ich in small fish); also used to curb the absorption of nitrite, and to reduce the osmotic pressure exerted by fresh-water on any hole in the skin or gill; Dosage and dosing: To produce a 0.3% salt solution (a treatment dosage against most protozoan parasites), 1 tablespoon of salt is used per gallon of water; to produce a 0.6% salt solution (a treatment dosage against Trichodina), 2 tablespoons of salt for every one gallon of water; and to produce a 0.9% salt solution, 3 tablespoons of salt for every one gallon of water