I think they make those with thinner glass since it's not made really to hold water. And sealing it up with a piece of glass seems sketchy. I wouldn't want something to go wrong and have 90 gallons of water on the floor. What's cheap? Cheap compared to that, b/c that's ridiculous! That tank is $500 w/ shipping and I could get a new tank and stand and maybe other things at the lfs
for that price.