The standard dosage of liquid baytril for a 400mg turtle would be between 1 ml and 1 liter. However, it is best to ask your veterinarian before you begin.
The dosage varies depending on what you are treating. A veterinarian who specializes in herps should be able to guide you as far as how much to inject your turtle.
The amount of liquid baytril that you would need in order to injext it into a 400 mg turle would be about 1 ml to 1 liter. This is the general guideline that is used by most turtle caretakers/lovers.