ID Help?

I showed this to blue2frye and there is some uncertainty from both of us about the type of African Cichlid this is. The video below shows a few different fish, but the one I am trying to confirm an identity on is the gray looking one that I follow with my camera. The thinking is it's a cobalt zebra, but want to make sure. Any help would be appreciated.

Thx

http://www.tkzm.net/videos/slate.avi

I will try and grab a picture of him with better light. It's been pretty hard for me to get pics because they get all obnoxious when I go close to the tank.