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Thanks for the help, I looked at some pictures of flukes but the lump on my fish is more like a swelling than that of those in the pics, there's no discolouration or anything. Is there anything else...

My fish has a huge lump on it's left side, right behind the Gil and fin. I've separates him/her from my other fish to a new tank. He's still swimming about but the lump is almost half as be as he is....