it could be that the eggs aren't fertlized properly and they're eating them out of instinct, or they could just be complete newbs. I know that they rarely are successful their first few times around so I personally would just leave them alone. When they do finally get it right they are awesome parents.
If you must, you can pick up whatever the eggs are on and gently place them in a cup under water then move them via the cup to an awaiting nursery tank.
And never put metal in a tank. Sheesh,what on Earth?!