You will probably never need to spit out ALL the replies so I added the arguments above it. You will probably never use anything more stripped down than this when spitting out replies.
<? $replies_args = array( 'post_parent' => $current_topic_id, 'posts_per_page' => -1, 'order' => 'DESC' ); ?> <?php if ( bbp_has_replies($replies_args) ) : ?> <?php while ( bbp_replies() ) : bbp_the_reply(); ?> <?php bbp_reply_content(); ?> <?php endwhile; ?> <?php endif; ?>