I have looked into peppermint shrimp and found there is actually 2 kinds that are sold as peppermint shrimp. True peppermints have dark eyes and sway back and forth. They have one they call dancing shrimp and they have green eyes and sway back and forth these don't eat the aiptasia.
Copperbands are great fish as long as you have a tank large enough and a source of live foods.