Ahh that’s not good to hear! They are swimming together so hopefully they get along! My copperband instantly showed its top spikes and after that point the tang wasnt 100% sure and kinda just chased rather than ‘stabbing’ him... the tang stabbed once or twice but no damage, will be keeping a good eye on him! GOOD NEWS!!! my copperband has a taste for aiptasia!!Not terribly under weight, no just could use a little extra. Glad to hear its eating out of column. Good sign! Watch that tang though. Mine went from chasing the CBB to one day having a nice cut. My CBB started to get tired of being chased and started standing its ground showing the tang its top spikes and thats when the tang started using its tail. Maybe yours will get along hopefully but let me tell you a tang can eviscerate another fish so quickly that before you know it its a goner.