Happy as a freshwater clam?

[ken0042]

Hey there everybody! I picked up a few freshwater clams about a month ago. I had thought my water was clear before, but wow, what a difference adding the clams has made.

My question is this? Should I move them around the tank? They did dig themselves into the gravel, and have now come back out. I don't want to disturb them if they are happy, but maybe they are waiting for the current to drag them to a new feeding ground.