[video=youtube;gR7aD7I6eKk]https://www.youtube.com/watch?v=gR7aD7I6eKk[/video] My black spotted is thicker than and much more aggressive towards my fire eel. He is also a much more aggressive feeder, you can see him taking food from the ghost knife in this video. I kept two peacock eels in my old geo tank it was a very nice combo.
Kept a Zig Zag Yellow Tail in a CA/SA mix tank years ago. Great personality, wasn't shy, begged for blood worms and let me feed it by hand. It also photobombed pretty much any picture I was trying to take of any other fish in the tank (begging for worms). I miss that eel...
Doesn't get that big, but can fatten em up nicely.