2' heh :lol: I will see if I can dig up the T. Gigas at the Wikiki aquarim, if I am not mistaken, its in the neighbor hood of a few hundred pounds and in the wild I believe these things can get to be the size of VW Beetles. Truely a beautiful clam to loves of the Tridacna's, I would love to get a small one, but they are kinda hard to come by, from time to time though I see an influx of them into the hobby. As far as corals go, one of the current hot corals that I would deam somewhat 'rare' would be the blue tort. It has a high demand and supply just hasn't caught up yet.
~Kelly