THe problem I see with setup is with the trigger! what type of trigger is it. Most experienced eel keeper can tell your that your trigger will most likely aggitate or aggravate your eel. Puffers and Triggers are believed to be the smartest of all bony fishes, and anyone who has kept a trigger can attest to a great deal of learning and association. I wouldn't do it if the trigger is of medium size and if the trigger has already established him/herself. The trigge will see this strange fish most likely in the evening, nd be like whats that! You can almost be sure that it'll investigate and see what it is! What it decides to do, well you'll just have to wait and see but I think the trigger will have the upper hand!