Hey everyone, I have a new problem for you all. I hope I'm not just being paranoid.... I have a fantail goldfish in my cycled 20gallon tank. He's mostly orange with some black on the edges of his fins. I got him about two weeks ago and yesterday I noticed that he had a black spot on his left side. The spot is about the size the O makes on your keyboard, and really just looks like his scales are black. The ph, nitrate, and ammonia levels are all good, so I was just wondering if you guys thought I should worry, or if fish do change colors like this? I'm almost positive that the spot was not there 2 weeks ago. Thanks for any help!
