what kind of lighting is on this tank?
the carpet will need halides, and honestly the other 2 would be better off with them too. good CAL, ALK and MAG levels are also required for the nems health. they basically require a reef enviroment.
i vote no anemone ( but ofcourse its not my tank ) as clowns will host what THEY feel comfort in, not what you offer them. granted if theres an anemone available they more then likely would someday catch on, but that choice is theirs, as again its what they feel comfort in. ive seen clowns hosting corals, powerheads, glass scrapers, even a clam.
and the picture gets taped to the outside of the tank, so the clownfish can admire it.