I have a large fancy goldfish which has had fin rot for some time. I have tried numerous treatments which seem to get rid of the fin rot but for it only to come back. I suspect that the fin rot is a secondary infection caused by some internal bacteria and think the only way I can effectivley treat it is with antibiotics. I know that in the UK you can only get fish antibiotics from a vet but can anyone get fish antibiotics from a vet or do you have to be in the fish trade?