Im no expert, but the rtc and peacocks might be able to co-exist as long as the rtc isnt big enough to eat the peacocks. I dont think the chocolates get big enough to stay safe from the rtc once it reaches adult size and I dont know what that last one is.
As for tank size, minimum 500 us gallons for either a single rtc or 3-4 peacock bass of the smaller breeds, to have both I personally wouldnt try it in anything less than a 1000 us gallon tank or pond.