Is anyone able to help? I have two Colombian sharks which I bought around 2 months ago. One if absolutely fine. The other has recently developed some lumps on its head, and a large red lump just by its gill. All of the other fish in my tank are absolutely fine with no lumps, so I don’t think it could be white spot or anything like that. Is this something that Colombian sharks may be prone too, or does anyone know what this might be, or what I should do?