Because your tank is made from glass and is big, you need to definitely find someway to brace your tank. Make sure the brace is big and strong enough. If your tank was plexi, it wouldn't be that much of a concern but glass is not made to flex. I remember having a 100 gallon glass tank. I was keeping a 12 inch koi in it for about a week while my friend was re-arranging his pond. One night I was walking by the tank, the koi slapped its tail against the glass, the center brace broke and then the tank shattered. Not much fun cleaning up water and glass at 2am. Koi was saved.