I personally don’t worry if it’s in small amounts or if you just remove the majority of the sand after lowering the water.
It you only want to take a small portion of sand out to create a thin layer of sand in the sump then I wouldn’t worry about going into extra steps and would just do it during a WC.
If you wanted to replace the majority of the sand then you would need to go into extra steps (which I had to do). And doing this would make the garden (and house) look like this;
This was just one water change that took a good 5-6 hours but was worth it as now I have a pleasing rock scape and different levels of fine in the sandbed.