Weird lump

Abif

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Jan 22, 2024
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Gloucestershire, England
Does anyone know why my guppy has suddenly developed a big lump in its tail? I have two others which look normal, but this is large!!
IMG_7643.jpeg
 
There is a very strong chance it's cancer. If not, it could be a bacterial cyst, in which case you don't want him in the tank with the other fish. The bacteria bursts out of the cyst as the fish dies.
 
This is something you just can not heal. How fast did this develop?
 

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