How large is this tank to begin with? And I have had similar issues with adding a butterfly with a tang, tangs get very aggressive when new fish are introduced into their tank. lol
I have lost 3 copperbands in total, they are definitely a hard fish to keep.
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.