Sounds like you have a perfect sandbed maintenance system.They handle the top inch or so where the sediment builds I imagine. Every 3 months or so I very carefully run a plastic scraper blade along the outer edge to clean up the algae. But that's it. It is a very light load tank. Total water volume maybe 55 gallons and I have 3 damsels and a clown. That's it. Feeding is once every evening and I only add what doesn't hit the sand bed. I also have a reefwave25 running at 40% on alternating directs that really keeps stuff from settling in that tank.
Note to self: plastic scraper blade