I dont believe anything is serious yet as he is swimming and happy as always,but I want to be sure. Leon,on his small bottom fins in the front, have white trailing tips. I thought it was just his colour but the thin bit fell off. That is they spot that is white,there is no shine or fuzz and is totally opaque. As for the silver, it is on a vein in his tail and is quite shiney.I dont remember it from before but it may be colouration. Should I be concerned?