How co-founders can address their conflict patterns before they damage company culture

My co-founder handles all the sales and I handle product and we've grown to 20 people but we've never learned how to disagree productively and now when we have conflicts we just avoid each other for days and the team can feel the tension. Last week we had a huge fight about pricing strategy in front of three employees and I could see them looking uncomfortable and I realized we don't actually know how to be leaders together.