I'm new here so hopefully I'm doing this right. I have a 12 year old comet goldfish. He started out orange and black, then over time he turned white, and he's been solid white for several years now. In the last few weeks I've noticed the tips of his fins are turning orange. It's not blood running up through the spines or anything, just the very tips are changing color, very uniformly. His fins aren't fraying or rotting, structurally they look totally normal. Coincidentally, his eyes seem to be turning orange as well. Personality, appetite, activity level etc. are all normal. Is this normal? Or is there something wrong that I need to treat? I bought him as a feeder fish for 6 cents expecting him to last maybe a few weeks, but here we are 12 years later and needless to say, I've grown pretty attached to the little dude. If there's something wrong, I want to help him before it's too late. I have another comet in the tank as well, a small younger one I've only had for about 6 months. He's always been solid white. He's unchanged, and seems perfectly normal. Tank: 40 gallon, water kept at ~26-27 degrees C (I think that's about 78-80 F). Water quality: I test weekly and my levels have always been good. Diet: He eats mostly a variety of floating goldfish pellets, and occasionally thawed peas without the skin. I've tried giving him little bits of greens (like kale etc) but he never shows much interest.