From what I understand, the word dropsy is literally referring to the edema, or swelling of the fish. What causes the swelling is unknown, and may vary. Some think the swelling can be caused by a bacterial infection. My friends fish had dropsy who is still alive today, she gave Maracyn & Maracyn 2 as well as epsom salt baths.
I've read not to add aquarium salt because that makes it worse. I've also read epsom salts make it worse. Basically it seems like no one knows for sure. I've read antibiotics can help, but I've also read antibiotics can make the kidney failure worse as antibiotics are hard on kidneys. Maracyn and Maracyn 2 are good in this regard because I think they're relatively easy on the fish. You should tell people not to waste a bunch of money adding loads of antibiotics to the water, though. They should make sure the water is clean, then pick one antibacterial medication and stick with it.
I've read not to add aquarium salt because that makes it worse. I've also read epsom salts make it worse. Basically it seems like no one knows for sure. I've read antibiotics can help, but I've also read antibiotics can make the kidney failure worse as antibiotics are hard on kidneys. Maracyn and Maracyn 2 are good in this regard because I think they're relatively easy on the fish. You should tell people not to waste a bunch of money adding loads of antibiotics to the water, though. They should make sure the water is clean, then pick one antibacterial medication and stick with it.
