I hate light blue or medium blue, it looks so fake IMO. I would go with the darkest blue you can get at the paint store like a midnight blue if you're set on blue. I prefer black because it makes the colors on the corals seem brighter behind a dark background and it gives that infinite depth look at least until it gets covered in coralline algea.
i would agree that going with a dark or royal blue looks best. light blues make the tank look a little more fake in my opinion.
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