Copperbands are quite difficult to keep alive for long periods of time. They are challenging to feed, need somewhat PEACEFUL tankmates and a tank that has been established for several months. A picasso trigger really wouldnt be a suitable tankmate long term. Like said before a large tank with MUCH live rock would be needed. If the copperbands are already eating and have been in a captive environment for awhile may have a chance but i would pass on them. Just my opinion