Copperband butterflies may nip tube worms, zoanthids, LPS, and certain soft corals like xenia. However, it really depends on the individual fish. Some copperbands are great reef inhabitants, some are not. They're not easy to care for, often refusing to eat. Quarantine in a separate tank for a month. During that time, try to entice it with garlic soaked food dropped in an area of high flow. If you don't feel you can care for a copperband, you can inject aiptasia with concentrated lemon juice or kalkwasser.