Back when I did Fish Onlys, I more than once had triggers and lions.
One time, my Assasi trigger killed the Volitans lion, then died from the sting. The coral banded shrimp had quite the feast that day...
The other time, I had a Clown trigger irritated everything that moved, ate rocks, came after me in the tank, and was generally a PITA.
I would stay away from the trigger. They are beautiful fish that should never make their way into a fishtank. Too moody. No offense to those that have them
My lion ate a flame angel once that I never in a million years would have thought would fit in his mouth. I say this because the flame angel and the hippo tang have a similar body shape/size. In fact, a hippo is a little more slender than an angel, and an easier fit. It lived fine with a Coral Beauty though, which again, is similar in body shape. Go figure.
Purple tang,
should be ok as long as it's big enough.
As for eels, i have no experience with them, so I wont comment.
