Thanks for the warning. I've removed it and have built up that side with soil they're used to in the terrarium. Also put some flat rocks in water dish for smaller turtle and built up by the wooden divider to avoid flipping over. Rescued the smaller one earlier today upside down in the sand...
Have 4 younger box turtles that live in a 40 gallon indoor terrarium. Wanted to expose them to outdoor sun and air on warmer days. Bought a Gorilla Cart from Home Depot and made a plywood bottom. Put Vita-Sand in one side with a water dish and strawberries in the other. So far, it seems...