I'll spare you the Bond jokes.... I had 2 x 70 7/8 pieces of glass cut for my coast to coast overflow for my 180 build. I was going to use reef safe silicone. But then I thought, to bond this- why not use Epoxy- which is also reef safe? I can seal it with silicone. I'd like to hear from people that have build an overflow like I'm building, and anyone elses thought too!