I thought a deep sand bed acts like a filter system of its own, I didn’t realize someone would want to replace it..isn't it like wine, only gets better in time?
When I first bought my 90g tank I added really fine sand and even after a few months of it running, it would blow up into the water very easily so I bought larger sand to throw on top of it ones, and I had to add like a cup a day, made such a mess of my tank - now I have like a 4-5”sand bed
Mine has been in my tank for about 4years now, I am not worried about it, if you want to keep it clean get a fish that filters the sand or sand shifting star fish, something that moves it around and finds food in it to eat, but I hate those guys…once I bought a horseshoe crab
that I got rid of rather fast since he threw so much sand on my rocks.