Gotta concur. Mixing asians, africans, and amazonians in the same tank can only lead to problems. They have to use the universal language of aggression because they evolved too far apart to have any understanding of each other, and the water chemistry preferences of each are soo different from the other two that only one group can be happy at any one time, if indeed any of them can be.
I would move the Africans to their own tank set up with conditions they prefer, and adjust the first tank to accommodate the other fish optimally.
Otherwise, a tank divider screen may be your only hope, although with even less territory available to it, the red will make life even more miserable for whatever fish is stuck on it's side of the screen.
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