ich like that doesnt happen over night... holeh
Next time keep an eye out for any fish scratching on rocks. It is the first sign of an infestation. ^he is right, something like that will take several days to get that bad and it may be fatal if not caught early enough. Fun fact:it is not the white dots that you can see on the fish that do the most harm, it is the many more that are stuck to the gills of the fish which can eventually kill it.