triggers are nasty buggers. if your dead set on that trigger it could get rough. i would look at the more docile triggers like the blue jaws, nigers, crosshatch($$$). i had a blue jaw in with my puffers, lion and eels and he did awesome. he died when i moved. snowflake eels, occulted morays, chain links eels are your best bet. I've kept all three with no problems. currently my SF and CL eels share a den and seem to hunt together. my porcupine puffer and stars and stripes puffer live fine with my lion, the SS puff actually sleeps under the lion. so its possible. they've all been living together for almost 3 years. the SS puff is new but he fits in well. the other inhabitants in the tank are rescue fish, the "half" of a remora shark. a tessalata eel at the LFS bit about a 3rd of it off and he lived so i brought him home. he eats like a pig. and then a tailless panther grouper. but my tank is overstocked but well filtered and they all get along great.