I'm still a bit new to the tropical fish keeping but I need to pick your brains and see if you know what this is?? I bought two sailfin mollies on Thursday, 1 male 1 female and he female who is a white and yellow looks like her scale are flaking on the back of her neck. I have just got home and the male is rubbing himself against the filter. What do you think this can be??? What treatment shall I use?? 
