Please help my betta! I did a water change yesterday. Nitrate was at 10 ppm before the water change and all other levels were zero. She lives in a 5 gallon, cycled tank with one mystery snail. She has a big bump behind her fin. Her fin and gills on the one side of her body stick out awkwardly. The bump is pink, like the rest of her body. She can still move her fin, but she can't move it too much. She seems to be breathing normally. I think the gills are just sticking out on the one side because her fin is sticking out. Should I use salt? What type of disease do you think it is? Could it be a tumor? I'm really upset. She is hiding behind her clay pots and she struggles a little to swim. I can't get a picture because she's hiding. She eats a diet of freeze-dried bloodworms, spirulina pellets, shrimp pellets and occasionally a tiny bit of algae wafer (she mooches off of the mystery snail in her tank). Please help me; I'm so worried.