Dropsy itself is not a disease but a symptom that can be caused by several things including a bacterial infection, virus or even parasites. It’s very common in tropical fish, especially Betta splendens and sadly it is usually fatal.

betta_01, originally uploaded by james_b_b. Q: B wrote, I have been all over trying to get help for my betta, Fritz. He has been sick for over a week now. Color is dim and he just lays on the bottom, rarely tries to swim or eat. I have changed the water, even tried lowering the [...]