ok i have four fish. one red capped (not an oranda), two black telescopes and one fantail goldfish. i had another red cap but it died a few days ago. now, one of my telescope has a white thing on its mouth and it looks like its been bitten off but not the whole thing. and there's a flap thats covering half of its mouth so it can't really eat. then now it looks like as if it's bleeding. there's a red thing on the edge of the white whatever thats on its mouth. i don't know what disease this is. please help me identify what it is so i can buy the right medicine for it.