Sorry to all for the delay in an update. I'm sure it was because of the same reason you see project posts unfinished with no updates. I had to scrap the whole project! The Quikrete Hydraulic cement will not work for this, at least without being sealed with something. When I fill the tank with water, a crystal film covered all the glass and parts of the wall became soft & crumbled / dissolved. I wound up taking the entire thing out & had to scrub the glass forever to get the film off. I was so frustrated with all the time & $$ just wasted I simply avoided the whole thing, including this thread. (which is why I think so many project posts become abandoned here).
I do apologize to everyone for not updating sooner.
Joel