I have a peacock eel. Super great fish, mine will swim around in loops all around the tank. But they require super pristine water quality that I have struggled to meet before. There skin is super delicate and when I first got mine at petsmart the guy netting him was super rough and cut him up, in quarantine I managed to heal him up, but then a few weeks later got a scrape and a nasty bacterial infection, which he is still recovering from. They are super beautiful fish, but also super fragile. Mine is usually super playful, not sure about all of them though.
Hope that input helps a bit.