Hi everyone, I just joined Aquarium Advice. My 6yr old daughter has had 3 goldies for about 8 months. Last week (at the advice from petsmart) I placed a container with salt inside the tank because one of the fish was stressed out. Everything was fine until one of the other fish banged into the container, freaked out banged into the tank wall and started twirling and swimming upside down till he calmed down. I thought he was going to die (belly up) but luckily he seemed to recover. Well 3 days later I noticed that he has a large lump on the side of his head, and he acts like he can't see anymore (bangs into the tank walls, swims only along the length of the tank next to the tank walls, food just passes in front or beside him but he doesn't reach for it just opens his mouth to eat) I added melafx and salt to the tank, but today the lump is bigger than yesterday. Should I have him checked out? Does anyone have any suggestions on what I can do about this? Will it go away? Do you think he will die? Any help would be greatly appreciated! We have come to love our goldies very much and are sad and worried that he may be suffering. Thanks for any and all feedback!