Hi All, I was wondering if you could help me. I have a green spotted puffer which has been really stressed in the last week or so. I have no idea why this is the case. I changed the water and that didn't work. I'm lost ad I decided to just put him in a hospital tank as he could be suffering from something that I can't see. His white creamy bottom has a few spots with a dark gray/black tone and there are two spots, pitch black in color that are located on both the left and right sides of his mouth. I've always use that as an indicator for stress and this time, it doesn't seem to be working. He's always been in good health until now. I can't seem to figure out what's wrong with him... Would appreciate any suggestions.