I have a kohaku that is eating well and is active, but it has what looks like tiny red veins on it's white. Each side of the fish has horizontal hair thin red veins. I thought it was just a product of stress, but the kohaku female has had them for about three days.
There is no reason why it would be stressed. Disregard the misshaped pec fin. That is just a birth defect that the kohaku has always had.
I am attaching pictures. Any opinions are appreciated. Thanks