HI all, I recently got a 75 gallon tank given to me, its a 2004 model tank, I found a sticker on the bottom with a build date beforre I filled it. It did not come with a lid so I went to the hardware store and bought some thin plexiglass and some hinge material and built a lid myself but over time the plexI has started to sag in the middle and is almost to the point of touching the water. I have gone to several aquarium stores to find a glass lid but they all have told me due to the tanks age they don't carry a lid to fit anymore. All of the lids I can find are about 3/8" of an inch too small. I can buy glass at the hardware store to make my own glass lid but it is un tempered glass which I am leary of using in the event it shatters it will fill the tank with glass shards. Any ideas on where to find a lid for an older tank? The glass pieces need to be 16 5/8" x 22 3/4"