I built a tank many moons ago, comletely enclosed in a cabinet and to go in a restaurant. I thought if some drunken idiot smashed into it there would be a major disaster so I made the front panel of laminated glass. I can't remember the thickness (about 12 odd mm I think). It was never used in that way because the place went broke before it even opened so I had it at home for years. I still have it out in the garage as the glass got scratched. The back and ends were mirrored glass and it looked great when well planted. I nearly freaked when I was told that it was only as strong as the thickness of one piece of the glass.