Yes, in fact I just deleted it off my DVR and now I could just kick myself for doing that.
It was on either the Sci channel or Discovery. It is was called "The Mutant Planet: African Rift Valley Lakes". Full of African cichlids from Malawi and Tanganyika. It was way cool to see them in their natural habitat.
I believe you can probably Google search it and find places to download.
Edit: Ok it was on the Science Channel. Here is a link with some sample clips. I also confirmed there are places you can download it. http://science.discovery.com/tv-show...lley-lakes.htm