I have a superclean 50 HOB. When I did my water change the other day the propeller came off. I put it back on and thought everything was fine but now it's making a noise. I have to leave town for a couple of days so I unplugged it for safety sake. I have a double sponge filter in the tank. When I come back I guess I'll break everything down and take a look at it. Do you think I didn't put it back together properly?