I think I am pretty much screwed with having my bulkheads drilled at the bottom on my tank. I believe it has tempered glass but not sure. Not all of them had tempered glass...mine has same color glass and does not have tempered labeled anywhere like they have most of the time. Does anyone know for sure or have info, label says HM manufactured March 2000 and then sn#(this is on the top right of my tank)