Jennifer, Paros need between 3 and 6 months to grow and colour up; quite a longer time than many other fish. And they must be fed with a variety of good foods in order to accelerate that process. Baby Artemia are very good, but interchanged with Grindal or glassworms or small mosquito larvae or Moina is better. Daphnia do not contain many nutrials, but to feed them sometimes is not bad either.
Be patient! The males will become glorious!