The Copper Banded Butterfly I have now. My third one, raised from a beat-up 1 1/2 inch juvenile. The other two CBB I had never looked comfortable in my tank, constantly swimming back and forth across the front, or up and down in the corners. This guy spends the whole day elegantly scouring the rocks for tidbits. When he’s not doing that he sits motionless in front of his cave entrance. When he’s REALLY bored he’ll swim across the tank doing corkscrews. The most amazing thing I’ve ever seen a fish do.