Hello, so ive had my goldfish for 9 months and shes always had red lines to a degree in just her white tail. And I was stupid enough to do an fish in cycle so know I probably caused some of it, but my tank is completely cycled now. 90 litres ammonia -0 nitrite -0 nitrate -5\10 I do two small water changes a week about 40% each time. But the lines in his tail never go! And everyone always says its bad water but mine is fine. So can they be normal? He eats fine, swims fine, has grown. Heres some pics tho not that great! Thanks.