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Looking at some photos of folks using 36 inch fixture over 48 inch tank, it doesnt seem like there is much of a shadow, if at all (i am sure owners will chime in with their 1st hand experience soon).
If you are really worried about shadow why not just get 2 Photon V2 16 inch fixtures. They are good for 24x24x24, so place one on each side of the brace and you shouldnt see that much of a shadow from the brace.
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