I have a 420 I had my rays in I’m gonna sell..I just upgraded my rays to a 8x4 600gal. But it is only 28” wide so that probably wouldn’t be any use to your cause
I bought my new tank from tsunami aquariums. There prices are pretty good and the wait is not that long only took a little over a month to build it and ship it from Florida to utah. I was 5500 for the 600 gal out the door. (Tank only) I built my own stand. Might be worth looking into.. good luck!