That's a very small DSB area and it won't be effective. It's all about water and sand contact surface. And it doesn't seem to be deep enough. Ideally you should dedicate a whole tank of a decent size (or a container or whatever you like), aka remote DSB, and stock the container with sand up to 6"+. People also recommend to replace all sand in DSB every 2 years or so. Sand is cheap anyway. You don't have to use LFS sand. Do a search and you will see people are using hardware store sand successfully.
So to sum it up:
1. A remote DSB
2. a large surface area in DSB ( as large as you can).
3. A really deep sand bed, 6"+.
4. Be prepared to replace sand every 2 years.
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