The dreaded tessalata eel, just the name sends shivers down my spine. LoL.
We had one that was about nine inches or so, for two days exactly. First day he chowed down on my 6-7" bird wrasse. I figured okay he was hungry and that should sustain him for a few days. WRONG. Next day it was my saddle grouper. He expelled the saddle grouper though, guess it was a bit much for his glutton self. Next day we returned him.
That Fire Coral Eel they have in the Divers Den is gorgeous. We had one for four years he was gorgeous, very peaceful, bothered noone.
As for the feeding stick, that is the best way to go. The eel didn't even look for food unless he
saw the stick overtime. We used plastic tubing (hard kind) one large, one smaller. We'd put the food in the larger tube and push it out with the smaller one once it got to the eel. It protected the food getting it to the bottom of the 170g so none of the other fish got at it. And the eel got his meal.
Honestly I think no fish is safe with a tessie but that is just me and about every other person I've talked to. LOL. I was that specific tessies third home. The guy at the LFS thought he finally got rid of it.. until he saw us with a bucket in hand. He laughed and replaced the fish he ate and gave us a refund. He knew it was a bad news eel. LOL
Typically we don't give up on anything and had aggressive species of fish anyways to an extent over the years.. but they by far push the envelope.
IMO there are far prettier eels that are much more docile.
Good luck whatever you decide.