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@Bill It’s so challenging to get those decorator crabs to stand out from their environment, and I quite like the idea of using backlighting for that Bill!
It feels like the sponge behind is blocking some of your backlight, perhaps worth doing again with a more accessible crab.
Also, I’d vote for snooting the front light. Even if it means you only get a partial splash of light onto the crab, this will give more ‘space’ for the backlight to shine (so to speak).