the copperbands do eat aptasia, however once those are gone the copperband may starve. Before you bring home the copperband, make sure it is eating mysis. Mysis is the only other thing i have seen them eat. Mine would not eat cyclopeese,brine,or any flake...nothing but aptasia and mysis. Also copperbands are often captured with cynide, so again before you rush home with the copperband, check the feeding and health