Isn't that obvious?Sorry, but what do the numbers mean?
1) Rhinoceros viper + Fire skink
2) Caiman lizard + ...etc.
Because they do. You probably don't know that crocodilians eat or mutilate turtles, both in captivity and in the wild. That's why zoos try to keep adequately sized (and "self-confident") turtle species together with adequate crocodilian species. And even then you got occasional quarrels and accidents. If you want to keep Cuora sp. with crocodilians, Indian gharials might be a better choice.Why do you think that the Chinese alligtors would eat the Cuora sp. turtles?
In general, just listing rare, flashy or "exciting" species you "want to have" isn't very original; it's like a kid itemizing its favourite candies. Why not try to come up with exciting, novel (and practically functional) exhibit ideas for common species? Just remember Conway's Bullfrog exhibit story. And don't mix highly venomous and easily stressed snakes with other critters.