GoldfishFantasy
Aquarium Advice Newbie
Alright, so I got a normal fancy fantail goldfish. He lives in a 20 gallon tan and seems happy. Well, one day I noticed this small bump on his tail that was white, not sticking out or anything. We've monitored it but it never gotten bigger. But suddenly it grew over night and now it's gotten to this size (see the attachments) and is sticking out. We're going out of town so we're having to have someone watch and feed my goldfish, so if we don't figure out what it is now, he could die when we come back 6 days later. I really love this fish so I do not want him to die... please help!!