I have a male and female Blue Jaw Trigger. They have worked out great for me and don't bother anything. They also eat anything I put in the tank—TDO Pellets, Freeze-Dried Krill, and Fauna Marin pellets.I’d love to have a second tank but I don’t think I can swing it at this point.
As for the triggers I’m looking at the Niger, Blue Jaw and/or Picasso
Love the clown trigger too but I’ve heard they can be very aggressive.