I had a multiple ranged depth sandbed in my 33 gallon I never touched it never had any issues and even though I had a large CuC however they rarely touched the sand.
It is for the most part a personal choice but I would say don't worry about it the sandbed isn't all that deep and it won't cause you that much of an issue my sand bed was 4 inches deep on one end and less than an inch on the other end never gave me any grief and the tank was heavily stocked
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 My aquarium is nothing but a smorgasbord for my cats.....
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