Yes, copperband butterflyfish are hard to keep. Copperband butterflyfish are shy and picky with their food. They also require water temperatures between 73–86°F (23–30 °C), with a pH of 8.1–8.4 and a carbonate hardness (dKH) of 8–12, and plenty of space to swim.
Copperband butterflyfish also do not get along with other copperbands. It’s best to have a maximum of one per tank.
Additionally, copperband butterflyfish prefer live foods such as blood worms, mysid shrimp, brine shrimp, small pieces of clam, and black worms. Copperband butterflyfish should be kept separate from more dominant fish because of their shy behavior.