lets see it all depends on what type of trigger you want if you want a bit timid trigger like a niger, or a pink tail almost any thing you want but if you want like a clown trig you may want to go with something venomous.
but if I was gonna do a timid trigger, and angel tank I'd go with some thing like a hippo tank like dory fromfinding nemo, or maybe like a fox face, or a grouper!!!