I would think it would be no problem to keep clean if you reinforced the corners with a stip of glass on the inside as I described earlier. This will blunt them from the inside, and I would think any algae scraper would have zero problem traveling up to the inside seam.
eznet2u - The OP said it would be 3 sides viewable. To me this translates to rockwork coming up the center which IMO would look cool and unique.
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