A sand bed would be appreciated for sure. And it doesn't have to be that deep. Have about an inch of sand (1.5" inch at most) that my sand sleepers burrow into. They just lay sidways to get under the sand.
Also, I know that this is a top down tank and you don't want to cover it, but wrasses in generally are very good jumpers. Some more than others but as a whole family, they do love to dart around in all directions, including straight up.
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