Questions about positioning a 45G tank

Hi all,

I have a 45G tank in my living room running for few months now, my concern
is that because it is in the middle of the room span every time someone
walks by there is a slight vibration and I can see the water and the tank
shaking a bit. The other day I had couple of little kids visiting and as
they were running around the tank movement was ever greater. It almost
scared me for a while.

If I had to guesstimate I would say about 2/8th of an inch movement at the
top of the tank at the most. This is a 45G tall tank.

I suppose this is not the greatest thing to be happening for both the tank
and fish, but given that I don't have a concrete slab or a stiff corner in
the room that works well for positioning, how concern should I be for the
integrity of the tank? I know that it weights quite a bit, is all that
vibration/shaking jeopardizing the tank structurally? It is an All Glass
model if that helps.

Thank you all for any suggestions and insight.

Regards,

Steve