Thought I share this interesting eel catching vid.https://youtube.com/shorts/1j6OyJaOqwg?feature=share
I agree in the late 70's I worked in a pet department and the manager would order them sometimes. They were labeled as Marbled Eels. They were very difficult to handle and escaped easily.When I was a kid I really wanted a freshwater moray eel, and for my birthday my family told me I could order one. I got one online as a "freshwater moray eel" .and it arrived extremely small not looking a thing like the freshwater moray eel from the picture. 12 year old me was told by the vendor it would become that later, and my dad had no idea about any of it so we believed him. It went into a sort of brackish water tank, and disappeared never to be seen again. Occasionally my fish would disappear, but I assumed my fish had died then been eaten by the rest over night.
I move the tank about a year later, and it pops out when I am removing the cluttered décor. Aside from my mollies which would sometimes vanish I have no idea what it was eating yet it had grown several inches. I think I found out what he was when I took him to the LFS, not a fish anyone really knew much about though aside from it clearly being a predator.
It must be amazingly hardy as my "brackish" tank was a disaster even by the standards of child me.
That's a great point.What you are creating is not a swamp. So if it’s for the tank with lots of current then in reality neither the swamp eel nor the peacock is your choice.