My sexies like to jump around and close polyps which bugged me in the nano because it was more obvious but in the 65g they don't tend to do this as much, mostly hanging out in my birds'nest (which doesn't seem to mind) and rarely stealing food.
My gold CBB (in another tank) is a thief! but I only have a couple of corals in there so it's not such a big deal.
Other than the theft, niether of them directly harm the corals
One thing to consider would be that a lot of cool looking fish don't mind making a meal of a shrimp
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