It was always my understanding that the copperband butterfly was not reef safe. It will (may) munch on other anemones besides the aiptasia. I suppose this goes along with the old line that 'each fish is their own'. Some may, some may not. But it should be mentioned that the butterfly grows quite large (around 8 inches) and is a difficult fish to maintain.
, you'd be better off with the peppermint shrimp and Juice. 8)
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