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Hi Jo,
I like that you tried a blue background for a subject that is so often shot with a black background. I would have gone for blue if presented with the same subject/position.
However, I do prefer your black shot for composition reasons: the whip coral being on a diagonal makes it more dynamic, plus the (dragon?) shrimp has a little more space in front of it, which makes it more pleasant (the blue version feels a little “stuck” in front).