Sniperhank
Giant Clam Addict
Oh yes, they will. I had a small maxima that I was trying to keep several months ago. I put him in a spot that he should have loved. I'd come back from work and he would have himself halfway across the tank on his side. Either pushing the water out of themselves, as they are a bi-valve, or by using their foot they can motor along. My current derasa clam, which is massive and as big as my hand, will move some as well. I take him out of the tank every day to check for pyramid snails, as I have them on my snails. I wake up or come back from work and it always moves itself so it is in the flow of the tank just so he likes it. Just be careful that it doesn't knock itself over and can't get back up like my maxima did.