Keep in mind that in the wild it's not just the Anemone that protects the fish. Often, the only thing keeping a Bubble-Tip from the Butterfly dinner table is a pair of Percula Clownfish relentlessly protecting their Anemone. Many types of hosting Anemone won't last an hour without their Clownfish guests fighting off Butterflyfish. They are agressive when their home is threatened and most fish figure this out really fast and just avoid the Anemone. Once the other fish learn to avoid the Anemone (of whatever is hosting the Clownfish) the tank will be very peaceful.