I screwed up and didn't think about adding more than 1 tang to my tank to even out the aggression with the yellow eye cole tang. it has been non stop aggression since monday. the other tanf hides in it's own cave that i made for it. the kole tand figured out how to get in to the cave some time today while I was at work. I decided to try printing out a 11 x 14 picture of a tang and tape it to the front of the tank. sure enough I think the kole tang is scared to death now. it won't come out of it's cave.