Well, I confirmed again today that 55g tanks are tempered, apparently on ALL sides. I blew one a while back trying to drill the end panel. Today I imploded another one trying to drill the back. I'm just going to build the dang tank I want and be done with it.
prof, I was using my glass hole saw. The same one I have used many times to drill tanks. Do Not Work on tempered glass, LOL. Not a big deal. It was a used tank, just a bit startling when it imploded.
