I don't see why not, as long as you put in a thick enough piece of glass and then re-braced the top. I'm assuming it's braced now?
Won't be quite that easy, though. You'll have to remove all the old silicone seals and completely reseal your tank once the new piece is in because new silicone won't bond with cured silicone and you could very well have leaks where the new and old overlap.