You know what egg crate is right? The actual material itself?
Just picture this , cut to fit the top of your tank...
(searching for pic, other one didnt work)
http://www.astechplastics.ca/images/egg_crate.jpg
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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