Hello, my male molly has a white string at the end of his tail, he has a nipped tail and on that nipped tail area the white string is there. The picture below is not my molly but a sample of another fish, the string at the end of the molly’s tail is white and skinny and looks slightly longer than the string here in the pic, it does not look like the one below but it is kind of similar. Can anyone tell me what this is? Not a parasite right?!