I have 2, 7" Tinfoil Barbs that are very sick. It started with one and has spread to the other. It seems that their faces are rotting away. I am not sure how to treat them at this point. Do they have a chance? They are not eating. My tank also has 9 Red Eyed Tetras, and 1 Bala Shark. They are doing fine. Any Advice would be appreciated!