Blue is nice because (especially if you have halides) you can really see the shimmer on the back glass, which gives it a nice effect. I've never used black, but have seen it, and it just seems to dull... too dark basically haha. The blue adds a lot of energy, and in a way it just gives off more of an ocean feel with the blue backround. All my opinion of course.
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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