Greetings OSUaquarist! Everything is looking really good, however, I do have one suggestion. Seems to me that you have found an interesting clam that seems to open and close with ease. Why not prop it open and put a sunspot coral in it, or something else that does not require much light. It will eventually grow and overflow out of the sides of the clam!
(If you do not do this, I will come downstairs and push your tank off the desk!)