02-16-2008, 01:11 PM
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I once had a comet that survived for 3 weeks in a "killer" tank that had (2)26" gold clown knives, 20" rtc, a 15" arowanna, and a 3' tiretrack eel. I figured any fish tht could survive that long in that tank deserved to be saved. I pulled him and placed him in his own 20g tank. He developed the same symptoms. I found that he had hook worms. They were not all on the spots, but some were. I am not a goldfish expert, but have read up a little on them. They do morph, in color, as they grow older. This may be what is happening. I would also check for hookworms. You will notice them by looking for a raised scale. They can be removed with a small set of hemostats or may be chemically treated. I prefer the first method.