Files not distributing to new drive

I've added a new drive to my pool and I'd like to spread the files in the pool over to the new drive. I realize this isn't the default behaviour so I've added the "Disk Space Equilizer" balancer into my system. At the moment it's the only balancer I have enabled and the system STILL isn't moving the files (and therefore balancing the space).

Any idea what I'm doing wrong? Is there a log or something that I can check to see why it's ignoring the only balancer present?