Well, that's a 3" difference on either side of the tank that won't be directly lit. With good reflectors and a good quality fixture, you'll probably be fine... just put bright corals / creatures that don't require high light in those areas, such as sun corals or feather dusters.
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90g pltd: angelfish [black, leopard, platinum, silver zebra & gold vt] · glass catfish · harlequin rasbora · neon & rummy nosed tetra · sterpai & spotted cory · bristlenose pleco
28g pltd: scarlet badis · oto cats · bristlenose
16g pltd: flame & honey gourami · cherry barbs
8g (soon to be 18g): 15 lbs LR · 10 lbs LS · YSP · zoas · shrooms · flame & hammer corals · brittle star · scarlet & electric blue hermits · firefish
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