My clam isn't opening up, or at least very much. I tried him in varying places on the sand bed, but it doesn't seem to like anyplace. He also keeps getting knocked over by my fish, which probably isn't helping. I now have him up on the liverock in a crevice where he can't get knocked over, but I read that they usually are on the sandbed. I have LEDs for lights. He's still alive, when you make a shadow over him he slams shut, but I'd like to save him. I'm going to see if he does any better higher up tomorrow. Any ideas/help?