Depending on the thickness of glass, certain manufacturers tanks (including AGA) have changed over time. A tank that may not have had a center brace 5 years ago, might be 3/16" instead of the 1/4" it used to be. This is more common amongst the bowfronts as the manufacturers have now largely mastered the construction of them, where 5 years ago, bent glass was a relatively new thing.
If it was my tank, I'd get a piece of glass (1/4" 24x16 would be 20$ or less) then cut it to shape with a dremel, silicone it into place. The center brace would still be there - but at least it would be transparent.
For DIY canopy, flat white paint - yes mylar and some of the fancier materials could be better, but it's not significantly more reflective than good old tremclad flat white.
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