I noticed this growth yesterday. I have had him for about a week. He's in a 55 gallon with two other goldfish and water is fine. I can't tell if this is normal wen growth or some kind of bacteria or fungus as this is my first Oranda. Please help. Here's a link to my youtube video of him. Pictures are too hard to get.https://youtu.be/8S2PM0kYCo4