I took a bit of the question to be (correct me danb) whether the black neons will only want to school with other black neons or whether they will school with others like neons and cardinals. Seems like I remember from years ago that most schooling species will stick with exactly their own type, given the choice. But I don't remember, if I ever knew, how much they will school with another type when they are in the minority and another type is forming a school. Maybe you were saying that in your answers but I couldn't tell.