A tangs memory comming back to bite me in the butt.

I truly believe fish are much smarter than we let on. I believe they remember much longer than we give them credit for. They remember old faces and new faces, even if taken out of a tank for a few weeks. My white cheek tang is a pretty good example for this. About three weeks ago I bought a healthy copperband butterfly, but the tang wasn't having it and keeping it stuck in a corner for three days. For two days I worked at getting him out. I only got him because I had help from my dad and we used trout nets to corner him. I put him in the sump for two weeks and rescaped the tank completely. Last night I added him back with lights out and we went to bed. Today the tang is swimming and grazing around the tank, as if he was never in a sump for two weeks. 100% the boss and is only harassing the poor copperband. He remembers them all, the old and the new. Not harassing anybody else because he knows them well and already established himself long ago. The poor copperband is now stuck in a corner again because the tang remembers and his aggression is a little on the extremist side of things (though not as bad as he was at first). Looking at the tang, nobody would ever know he was isolated for two weeks. Even with the rescape he has clammed it all and he hasn't even been back 24 hours yet. For him to not remember he would probably have to be down in the sump for 3 months (which is to long for such an active fish). The copperband is pushing his luck a bit more this time, and whenever the tang isn't looking will swim around. There is a 50/50 chance this will work IMO. I will give it a few days, but if nothing improves than we all know what happens to the tang. That just goes to show that fish remember a good deal more than we think.