wayway, did you just graduate? If so, congratulations! :joy:
Now about your question. I'm a bit confused, did you mean coraline algae? Although, I guess it doesn't really matter because color has nothing to do with healthy. The healthiest types of algae to have in your tank, IMO, are macro algaes (cheato being my favorite) and any color of coraline. In any case, no matter what answer you were looking for, I can tell you that white algae is NOT healthy.