Thank you Korrine,
The first one is a derasa and the second is a maxima. i am strongly considering trading a bunch of my coral back in and setting this up for just more clams. I would like to have one of each commonly kept species. But with only 24 gallons it is pretty hard to do. I know that these will outgrow my tank eventually... which is way I had my wife name them so that she will get attached to them and, thus, enable me to buy a bigger tank when the time comes hahaha. Just FYI, the derasa is named "eddie" after Eddie Veder (I bought the clam the day after my wife and I met Eddie Veder in Memphis) and the maxima's name is, well, um, "Max" my kids named it, but I think it works. lol.