Watched it. Will probably watch it again.
A couple nit-picky things:
1) when talking about mbuna, when the narrator mentioned something about different species being able to share the same algae patch due to the way they eat, he mentioned something about the different species only being able to reproduce with their own species :? I think the exact line was, "different species sharing the same territory, that can only reproduce with their own species".
Maybe in the lake, there are enough choices where they choose to only mate with their own species, but that doesn't mean they CAN'T hybridize, as proven by many aquarists.
2) The cukoo catfish spawning bit was right in the middle of the malawi section of the show. I couldn't tell what species of catfish the cichlid spit out (for that matter, I couldn't identify the cichild off the top of my head, either). At first I was wondering if there were cukoo spawning catfish in malawi, or if they jumped over to tanganyka without clarifying, or if they just made a mistake. Anyone remember the part I'm talking about and can let me know what they did there?