Back in the early 90's I had a 135 that consisted of only triggers: Clown, Niger, Pink Tail, Triangle, Huma Huma, Queen, and Undulated. I had to get rid of the Queen because I could not afford to feed her. Although the Undulated was only an inch long he was the king. The rest got along great with never any fights. After fighting Nitrates for a year I changed it up and sold all but the Clown. End up giving my Undulated to my brother inlaw where in a week it killed his Niger that was twice his size. He got so mad that he refused to feed the Undulated for months. So the Undulated lived off the algae that grew in the tank until he called me to come pick it up and trade it in at Texas Tropical. Nothing is guaranteed in this hobby so go for it!