I once tried this idea in my 65 gallon tank. I added a 3" Niger, a 2" Huma Huma, and a 2" white-line. Nobody messed with the Niger but the White-line used to pick on the huma constantly. Then one day the huma fought back so hard that I had to give the beaten white-line to my friend, it eventually died from all the wounds. After about 6 months the Huma killed the Niger. So, my advice would be to not keep multiple triggers in a tank that size. It may work for a while but in the long run it didn't work for me so I'm pretty sure it could spell disaster. Hope this helps.
MakoFury