I have a Tire track Eel and a Tulip Eel.
Tire track eel is quite the character, he will only eat live ghost shrimp or live guppies... Still have no idea what the Tulip Eel eats, but he does. I am assuming he eats the shrimp or the guppies too, he looks healthy and I've had him over 6 months now. I also drop in frozen minsys shrimp. Tire Track Eel won't touch it, but I saw the Tulip eel eat one once.
I hardly see either of them, the both bury themselves or hide until the lights go off. They come out to eat and swim in the moonlights.