Hello, everyone! I am new to aquarium life but have quickly become attached to the Glofish I got my kids at Christmas. I noticed what seemed to be a bruise on the yellow fish's fin about a month ago and it has grown quite large, protruding on both sides of the fin. The fish has slightly distanced himself from the rest, hanging out mostly on the opposite side of the tank but still swims and eats fine. I'm not sure if it's a tumor of some sort or a disease that can be transmitted to the other fish. Please advise me! Thank you!
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