I had read before that you could mix danios with Malawi cichlids. I was thinking about trying "dither" fish wih my cichlids, so I went and bought half a dozen zebra danios. The minute I released them, I watched my big black mbuna swallow one whole. I quickly fished the five that were left out of the tank, and placed them in my community tank where they now happily reside. It may just have been bad luck on my part, but I won't try it again!!