How do you decorate red eared sliders tank?

Well, I have two red-eared sliders. And I just fill their tank with a lot of small rocks since I go to the beach sometimes, and I have so many rocks in my backyard. You don't have to do that, but then the "droppings" and food that's not eaten would sink to the floor and your turtle(s) would be swimming in it. If you have rocks, sometimes those things are buried underneath. I also have like small "trees" for decorations, and a shallow rock. If your turtle(s) are big and you realize the tank is REALLY dirty when you clean it, you should get a bigger tank or clean it more often. I clean mine 3-4 days and by then, it's really dirty. Well I hope this helped! If you have any more "caring for turtles" questions, just ask me!