I noticed that my 3 Platinum & Yamabuki Ogon have tiny bubble like holes on their head.
Is this an Ogon thing or a disease? Because I don't think I see it on my other varieties.
I've had "hole in the head" disease on my tropical Oscars before, but it's nothing like that. That was crater like and this is more like braille. It seems to start from the mouth and nostrils, and going along the sides, near the eyes.
I hear the term "clean head" when selecting Koi, but are these an example of what people would avoid?