I have had a pair of fire red agassizii for a few months with no aggression problems in my 29. There are other fish, but just look in my signature if you really need to know. The problem is I added a pair of trifasciatas yesterday, and my aggies are not very happy, and will not leave the tri's alone. They really haven't done any damage, and they don't dart around the tank, but if the aggies see them, they drift over and just nip. I have 2 terracotta pots and a breeding egg (just a dark clay egg with a small hole in it) in the tank, so they aren't fighting over caves. The problem is neither want to pick a side to live in. I rearranged the tank before I added the tri's, like I always do, but I just can't seem to curb the aggression. Anybody have any ideas?