Frendly fish?

[D12DetroitD12]

I was just sitting here watching my two bichirs and i notice that they really seem to like each other. They always follow each other around the tank and use to kill my crayfish together lol.....so does anyone else have fish that seem to interact a lot more then others?

 

[TTTT]

My con and EBJD are best buddies... they swim together and pick on my Severum together