Hitch Hiker from a rock I bought... had it QT'd for a month, please help ID

[slugwall]

I just found this when I added this new rock to my tank. He was on the move from a hole in the rock. Should I feed him when I get the chance? and what should I feed him. Please bump if I am in the wrong posting local...

 

[slugwall]

Thanks for the BUMP

 

[_sludgefactory]

It's a little clam, i got a bunch of them. No need to feed it and after a while you'll have more.