Glass Thickness For Large Tank

[Jaws]

Hey guys. I'm getting some mixed responses when it comes to the appropriate glass thickness for a large tank so I thought I'd throw it out there and see what everyone here thinks. So lets say for an 8 foot long by 3 feet wide by 30" tall tank, what would you suggest? My other option is 7 feet long by 3 feet wide by 30" tall. I realize that you can make a tank bullet proof but I it doesn't need to be overkill either. I'm just looking for what's appropriate or recommended. I'd like it eurobraced too. Thanks in advance.