An exotic fish was treated by Highcroft Vets and cured after a tumor was removed from it. /VCG Photo

Usually known as the molly fish, the "little patient" was only around one-inch long and weighed less than a gram, making it the smallest ever treated at the vet. /VCG Photo

Advanced practitioner Sonya Miles performed the 40-minute surgery by using a water-soluble anaesthetic. /VCG Photo

The fish has become Miles's smallest patient ever. /VCG Photo