Of course safety of your family is number one concern. But you shouldn't worry about it unless you have kids running around that can accidentally hit the glass, as I have never heard of an all glass tank explode spontaneously. The weakest link of a siliconed all glass tank is the silicone seal, not the glass itself. If the tank is made of too thin glass, the seal will yield first. A DIY plywood or cement block tank with glass front is another story. I've heard of explosion of the glass front due to water pressure.