I got this lil one a week ago from pet supplies plus and I’m trying to save him. I took him to the vet cause his tail was damaged started to turn grey and also the tip of his tail was damaged. The tip of his tail was bent and the vet cut off the bent/dead part off his tail and told me he was fine just to use mineral oil on him and said he should be fine that the grey in his tail was normal but I don’t think so. Today I noticed a little yellow by his tail area, is it yellow fungus or I’m just freaking out?