i have a Niger and Dog face and few others in a tank but no Mandarin, but i dont think i would, i had an engineer in their for awhile and they kinda hunted him and would realy stress him out so i moved him but at the same time i have a brittle star in there that they dont pay any attention too so would be hard to say and up to the individual fish. HTH
No, it shoulfn't work. Even if it does work at first, the niger trigger will grow big, and eventually stress the fish to death, or the trigger will eat it, the same thing for the puffer.
i agree, both fish are very aggressive.. i wouls not advise it.. do you have lots of pods for him to eat.. thats about all i could get mine to eat.. found out too late.. gone to greener pastures.. i hear that he only eats pods not much of anything else.