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If you catch Dropsy early enough, you must immediately place it in a separate tank. Put in 1 tsp of salt per gallon of water (this reduces the swelling). If your fish has this, it is highly likely that their immune system is already compromised (AKA, they are under stress). Since this is a highly contagious gram-negative bacterial infection, you should take care to reduce stress and quarantine at any signs of dropsy.
Contributed by Jessica Kalmazu Stimely