I have a tiger tail sea cucumber, and it is doing pretty good job and should be a good choice. That is if you can take the risk of it poisoning other tankmates if it dies. I had mine for over three years, so far it is still doing okay.
I also have a pink spotted goby. It shift a lot of sand at first (first few months), moving sand from one end of the tank to the other. Sometimes it moved sand from under the rocks, and toppled the rocks over. It stopped shifting sand all together a while ago. Now that I have it for 6 years, it only eats the fish food from the water column.
From my experience, they only shift the sand if the surface is not cover with slime, hair or other types of algae except diatom algae.
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