Please help. Discus pair fighting.

[Ryanalberta]

I am new to breeding discus and discus in general. I have always had fish tanks (fresh and salt) and have had success so I wanted to try something new so I bought a "possible breeding pair" form a local discus supplier. He told me that the fish have paired up and have layed eggs. When I brought the pair home I put them into a 20 gallon tank with a breeding cone. At first they seemed fine but the next day the larger one (the female according to the seller) started to bite the smaller one on the sides. Now the smaller one is facing the back corner of the tank and when he moves the larger one swims towards him and bites him on his sides. It's been 2 days now and nothing has changed. Any suggestions on what I should do? I am currently doing 50% water changes daily my ph is at 6.8, my ppm is at 80, and my temp is 84*f.

[Luke in Phoenix]

Some of my pairs will quarrel once in a while but pushing the smaller one into the corner is unusual. Not always, but often the males are the larger of the two...