Plauderecke » http://supplementstycoon.com/black-line-edge/

The perfectionist might also want to "burp" the device once in a while by using Black Line Edge rocking the tank slightly to pressure the air to move to the collar and hence get away. This could be very difficult with a preferred aquarium stand that is meant to preserve the aquarium solidly in area always. The pedestal allows the tank to be moved a piece, if you are careful and constant.

http://supplementstycoon.com/black-line-edge/