Help With Sexing Male or Female

[Departure]

I have this white butterfly discus that seems to have partnered up with another female, I just don't see it doing anything when the other female lays the eggs, This white butterfly get over protective of the eggs the other one has laid, even to the point where he/she chases off the mother of the eggs. I am starting to think this white butterfly is a female, but not 100% sure. I am hoping someone might be able to tell me what sex he/she is.

[jmf3460]

idk about gender, u usually cant tell until they spawn and you see their breeding tubes. but that is a beautiful fish. his really tall upper fin looks like an awesome hairdo