So I have sand on the bottom of my tank, I want something new since cleaning the sand is a pain and seems to get dirty really fast. I love the look but something new will be appealing right now

No bare bottom I did that for a year and as much as I loved the cleanness of the water I hated and got extremely bored of the look and not being able to put plants up or anything else. SOOO I came up with a idea. I want to use big river rocks, first layer of baseball sized river rocks, then on top golf ball sized river rocks and under all of it a undergravel filter, Thus having all the poop settle to the bottom under the rocks and into the filter I can easily remove the rocks every 2 weeks or so and siphon out any poop and just replace the rocks. The whole idea of this is to have a new cool look extra filtering

and keep all the poop out of his swimming water so he can swim vigorously like he loves to smack stuff around and no have poop all around him or in the water. Good idea or no?