a five gallon us way too small for either of those fish, even on their own. peppered copries get to 3-4" and zebra danios needs loads of swimming space. sorry.
I didn't pay any attention to that cd, you're right! Why not put the betta in the 5 gallon and get some pygmy cories to go with him, and put the danios, livebearers, and peppered cories in the 2' tank?