I'd presume he's talking about Orange Heads.
While David is right, I'm going to argue the point by putting forward the notion that if you're going to keep a certain type of fish that has taken your fancy, why not develop the tank to suit their needs? Eartheaters are infinitely more interesting when kept in properly structured shoals on a sand substrate when they sift in a pack turning over huge amounts of sand in search of food. It should be a given obligation that when keeping Eartheaters, you have sand, just like you need to keep them in water.