Oops. Sorry. I forgot to provide an update. I went to see my friend and look at his tank and after hearing his stories about things he had to do after he started with the clams, I decided against it.
Also, the ones he had were kind of bland in color and kind of large. I wanted one of the colorful Maxima clams or something like that, but that was not the case.
I really appreciate the feedback. I think that if I find a small colorful one at some point, I may give it a try, but I will first get past a few projects I'm working on for the house and make sure the tank survives them.