In the belief that an eventual deep sand bed is better than gravel for many reasons, I decided to take the plunge and replace the gravel (60g tank) with sand. In this case, left over tan pool filter sand.
> replaced the filter media with a good amount of polyester fiber 'floss' and left running throughout the process.
> removed about 4+ gallons into a 5g pail, with a small heater and air wand.
> removed the floating plants and the decor.
> moved the fish (no small task) into the 5g pail.
> used a kitty litter scoop to remove the gravel.
> removed another 5-10 gallons of water.
> added and shaped the pre-washed sand, shallow in front, deeper in the rear.
> replaced the decor.
> added conditioned water to refill.
> allowed some time for settling and filtering.
> moved the fish back home (water still a little cloudy).
> put the floating plants back.
> next day - service filter inserting desired media.
I think I might be adding a little more sand at the next water change for a little more depth and contour in some areas. I also think after the sand has 'seasoned' some I'll add some rooted plants and maybe try to find some MTS.