Here is a pic of mine. he was about 2' long
I had to get rid of him anything under 4" was expensive eel food.
Even a 4" fox face.
The only thing under 4" that survived was a Porky Puffer.
He was very aggresive!
I had him in my 90 gal with a Lunar Wrasse aprox 10" a Grouper aprox 8" and a Porky Puffer. When I got a larger tank and trying to stock it all hell broke loose with the eel! he had to go