If you have any Vortech pumps, I would recommend turning them off to minimize vibration as much as possible. Not sure what type of filtration system you have but another suggestion would be to bring down the water level in the tank (below where the shifting was initiated). That will decrease the pressure on the aquarium walls. But if your stand is off-balance to begin with, I'm not sure I would recommend lowering the water level. In that case, the outward pressure exerted by the existing volume of water may be preventing the aquarium wall(s) from buckling inwards...at least in that section. But my suggestions regarding altering the volume of water is based on an educated guess on my part, not experience. Just throwing it out there hoping someone with much more experience can either validate it or shoot it down as a bad one based on prior experience/knowledge. Hoping it turns out well for you....