Several of the tanks have a mix of predators and prey. They can't 100% prevent all negative interactions, but they do make sure to keep all the animals well-fed, and well-fed predators aren't going to bother unnecessarily expending energy to hunt while they're not hungry. They track the feeding of certain aninals, like the eels in the big tank, to ensure those aninals are eating normally.
Snakes in captivity are typically fed frozen mice. Snakes also usually don't eat turtles in general because they struggle to digest the shell. I suspect that this particular snake is well cared for and therefore doesn't need to hunt for its food
While I don't own anacondas, I do own burmese pythons which typically eat large frozen rabbits or pigs, not turtles. Turtles are not an anaconda's typical prey in captivity and might be too small for it to even consider it food. The process of digesting the shell would be too cumbersome for the snake's slow metabolism.
Yes, the turtle is large and healthy
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