Hopefully you got halides on your tank for that clam. Also, it appears to be gaping a good bit. In case you don't know, that is when the incurrent siphon is fully expanded like that; gaping is REALLY not a good thing. It may straighten it out when you do your next water change, or if you feed your tank and get it to eat a little. Please post some pics in the future to update on how it is doing.
Other then that, the coloration is very nice and the mantle appears to be in great shape. But I can not stress enough to keep an eye on gaping. Check all of your water parameters.