Keep in mind that goldfish come in many colors. that red spot is just a tiny pinch of ohne of those colors.as they age they may change colors completely.Hi, I've been keeping a common goldfish for about a year now. He lives alone in a planted 10gal with a HOB filter.
He's had this single red dot on his side since I got him. Its about the size of a scale, and it doesn't seem to be hurting him, but I am still slightly concerned.
What could it be?
Any help is appreciated. Thank you.