I have a group of 12 captive bred altum angelfish. A few of them recently paired up and it was just amazing to watch them doing their thing . However, they become very aggressive against the rest of the altums and pushed them all the way into one corner. They even take turns to attack the crowd none stop… I wonder if anyone here had experienced this before with the altum angels? Is there any way to reduce the level of aggression? Is the aggression going to ease after a while? Thanks in advance!