When my turtle was smaller, I had him in a 10 gallon tank and had fun decorating it with rocks and artificial plants. I really liked the look of it, here it is:
http://i224.photobucket.com/albums/dd176…

But cleaning it was difficult since everything got stuck in between the rocks even with a filter. He's not in a 75 gallon tank, about 3 artificial plants suction cupped to the bottom but nothing else, no rocks or anything like that. I really want to make it look nice again.
Is there anything different I can put at the bottom that is easier to clean? Maybe even some kind of sheet with gravel on it that I can lay across the bottom?

I like sand. It allows them to dig and particles don't get stuck under it but lay on top making them easy to siphon out. I use pool filter/ quarts sand and the particles are heavy enough that they don't really come out with the water if I accidentally suck to close to them. pets question and answers,www.5d2d.com

He's not or he's NOW in a 75? (Not that that matters much for the decorating it just didn't make sense in the question)

A sheet with gravel on it on the bottom would be so heavy that you couldn't lift it.The one decor I've seen a few times that is easier to clean than gravel is marbles, if you like the look.

Robert Price, Ichthyologist and Herpetologist