It's a light diffuser that can be had for 11 bucks each at HD, Lowes or the likes. It can cost a lot more at mom-and-pops kind of hardware stores. Most clerks at the store will not know what an eggcrate is so direct yourself to a light isle where they have all the fluorescent shop lights or drop ceiling panels. Comes with white, silver-painted or black.
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BAS - Educating Aquarists Since 1911.
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