Interesting.
"Shells is about 5" wide, currently growning under 120 watts of PC lightning in a 40g tank. Have this clam for about 2 years now, and now I have to sell it due to the quick expanding of zoo corals I have in my tank."
First of all, Crocea is the most light demanding critter in our hobby. I doubt that the clam has been in his tank for 2 years under 120w of PC light.
Second, zoos can not harm a clam! My maxima clam sit on top of my GSP which can kill anything in its path but the clam seem to be not bothered by it. The GSP polyps even sway back and forth with its mantle.
Third and finnally, the clam he's selling is too ordinally. Nothing specail, it's just a blue crocea clam. It's 55bucks total! I'm sure you can get a much better clam and a healthier one somewhere eles.
Check out clamsdirect.com right now. Their clams are always amazing.