I have a 31" tall cube (24"x24" base, 75 gallons) and a 36" tall 270gallon, both are all glass. The cube is 1/2" thick glass and the 270gallon is 5/8 thick glass. If the tank is built properly and properly supported I don't see any reason to be afraid. The biggest hassle I have with them is getting to the bottom for proper maintenance. I bought a 32" tall python vacuum attachment that has made life a lot easier, also a scrub brush on extending pole. Next i am going to get an extending grabber arm to move stuff around at the bottom.