Neons are very sensitive to Nitrogen pollution and frequently it is advised that they should not be added to a new tank for at least 3 - 6 months. They are one one of the worst possible fish to try and cycle with.
They should be kept in groups of around 6 or more, but that would very much overstock your tank.
White Cloud Mounain Minnows are egglayers, as such if yours is female, she may be carrying eggs, but is not gravid. These too, are a shoaling fish best kept in groups.