What is wrong with my guppy fish? I have a guppy who seems to have a damaged front fin. He is still swimming with the other guppies but isn't moving the fin that's damaged. I'm not sure if it's that the other guppies have nipped that fin or if it is a disease. He is fairly new to the...This is a truncated preview of the original post. Press here to view the full post. Post Comment Receive notifications Add a comment...