Update and bump:
I let this languish through the covid business, as well as some other issues at home demanding my attention. I never did mention the builder of the aquarium, as I was giving them every chance for a reasonable resolution.
I thought an apology, a new tank made correctly and to size, free delivery and haul off of the old tank, plus something extra for my distress would be quite reasonable. I coulda been a happy camper, Lauding their ways.
But they thought a discount on a new replacement tank from them was reasonable enough if I paid the tax. Well, Screw that!
It was Clear for Life.
And it's still quite clear. I'd just be happier if all the seams didn't look like a total failure and the top wasn't all warped and sagging. The manufacturer couldn't admit they screwed the pooch on this tank, and I sort of figured that I'd have more fun ranting on them for their inability to do right than fighting with them in any court room. I would not cross the Grapevine nowadays anyhow.