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It started with a dark patch at the base of his tail. Then finrot followed, then dropsy. The base of his tail is dark and swollen, it's the widest part of him. Is this a tumor/cyst? My other 2 fish seem fine.
I have had that "pinecone" thing happen to my guppies before, usually on the caudal pendecule. Not sure what causes it. Maybe too much salt, or rust? Or it very well could just be natural turmor or something. Dosen't seem contagious.