Lrry93, thanks so much for the photos with kids - we can gauge the window placement. I now can tell and am reminded why I didn't go this route and I also agree with others that this tank is ok for a fish that's on the move or sits almost always mid water. Other than that, it is hardly suitable for my purposes of public display or even for personal viewing.
... Unless, as suggested, the bottom is brought up with gravel or some other way. Even then though the corners are too wide for my purpose.
BTW, is the window glass or acrylic?
The 420 gal tank window in post #3 by Oddball appears to be significantly more viewer friendly, with much larger coverage. That I could consider.
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Did you get the 600? The difference in window size is worth upgrading to the 720...
Lrry93, AFAIK, counterintuitively, the window on 720 is smaller a bit than a window on 600 gal, or so it was 4 years ago:
The 600 US gal, 8'x4'x30", $1630 tank (product # FT523W2) has a 69"x17" window.
The 720 US gal, 8'x4'x3', $2005 tank (product # FT632W2) has a 63"x15.5" window (yes, even smaller).
Drive down and buy mine. I may sell it and go a different route.
Where are you located and how much will you want for it?