How do you treat dropsy in fish? Well every case is different, but I’ve treated it with antibiotics directly in the feed throughout the sickness, 1 teasspoon of methylene blue per ten gallons in the tank water, and 1 tablespoon of salt per 5 gallons in the water, and a slightly warmed temperature (78-82) and so far I’ve noticed great success with it. #fish #goldfish #aquarium #ranchu | Luke’s Goldies