While working on my lights my wife went to put one of the screws into the light cover it felk into the pump chamber.we couldnt find the screw for a bit and had no idea were it went.i finally located it halfway under the main pump in the rear chamber, I was worried I was going to have to take rocks out if I didnt find it,my question is what would happen if it was in the tank unfound? would the metal in the tank poison things? im sure it would rust causing more problems.just happy we found it but not until I lost my religion, dropped a few f bombs,and was searching ferociously like a cop detoxing,lol