I'm planning to keep a young Chinese algae eater with a baby red-eared slider turtle in a 500 gallon tank. I'm aware that once the turtle reaches maturity, it will view the algae eater as a meal and will attempt to prey on it. Accordingly, I'd like to add a safe refuge, one that will permit the algae eater to leave whenever it wants to, but at the same time, will nevertheless prevent the turtle from entering inside. Or would a simple tank divider work best ? Does anyone have any suggestions at all? Any feedback would be most appreciated. Thanks