While this is a great size (large) for an adult turtle, the magnets supplied are nowhere near strong enough. As soon as my 13yo Murray Shortneck puts any weight on the dock to climb up, the magnets disengage & he's left hanging on to an unstable platform.
I've tried stronger batteries outside the tank, but no joy. I'm considering drilling into it and attaching an old dock attachment (suction) to keep it stable.