If set your discussions up for students to reply to one or more questions that you post inside the discussion forum, Harmonize discussions are a great tool to consider. Using these question numbers as their post cover graphic can help guide students to click on the question posts and NOT create new posts.
When assigning student facilitators to create posts with their questions, the same is true. Ask them use the question numbers below as their post cover image to help guide students to click on the student-generated questions to create their comments.
Within each zip file, you will find graphics labeled Question 1 through Question 11.