Crue, your welcome. Thanks gas. Gas did you use the suction cups? If the unit is cupped to the wall with the 4 threaded suction cups, and attached securely to the bracket with the 3 nylon screws, it should not be moving around. I just tried to move mine and it didn't budge. Check it out, although if there is a little play happening, it won't affect performance and I doubt it's something to worry about. Widening the slot on the bracket would be good if it is in fact small. That or ask Jody to send you out a new bracket. He sent me 2 brackets free of charge (1 for the left, 1 for the right) that were a lot longer then the normal versions, as I have a 1/2" acrylic tank, and I wanted a bit more breathing room for the motor. Let me know how it works out.