ok well my swordtail has some sort of disease. it basically looks like how a snake sheds its skin except the fish's skin is not actually shedding, or when you take a long shower and your fingers are white and your fingerprints are swollen with water...same thing is happening around the base of the tail, it is white and takes the shape of the scales, what disease is it and how could i treat it? new patches are forming up on the other side of the swordtail! already my guppy has died of it so it must be either contagious or some sort of parasite...