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I would have said lymphocystis! - so will be a good discussion as to what it isGenerally, when you see growths at the end of a fin like that, it is very often a lesion from the Lymphocystis virus. However, this does NOT look like that. I agree, could it be something that got caught on its fin? If it has been there for a few days, it probably isn't that. Can you post a clearer picture, with less of a blue hue?
Jay