Yes and you can use that to your advantage. Clams like the most elimination and gentle flow. If you have a clam that likes a sandy bottom you make a shelf higher up in your tank add a sand bed to that shelf and try your clam there.
Here is my Derasa doing very well on the bottom and my Maxima perched on a rock doing equally as well
BTW Meowzer if I have said it once I have said it a thousand times “you do have a beautiful clam” umm I mean clams









