HELP! I have a hitchhiker that I can't find. I thought I knew what rock he was in, but I removed it and then couldn't find him. I am losing fish almost daily. I was told to place a glass with some bait at the bottom, and he should not be able to make it out of the glass. Well so far, no luck. Any other traps or suggestions? I really don't want to take all of the rock out piece by piece.