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Thank you for you speedy response. Unfortunately the fish died over night. I think it was probably an aggressive form of columnaris because it was killed so quickly. The other fish seem ok but I'm going to treat the tank anyway. Thanks again

Hi, I have a guppy with a white mass on/around its head that appears to be eating into its flesh. The white mass appears to be mostly on top of the head, and partly under the right side of the mouth. I would really appreciate any help you can give on the type of infection and any action I should...