Thanks for all the comments.
BrianNY....yes....they do dig in the gravel, just like their Asian counterparts. The gravel in this temporary grow-out tank is a bit too big for the eel to burrow into so it has taken up residence beneath the driftwood you can see behind it in the picture. It sits in there with its head sticking out like a Moray Eel. I has already eaten the two feeder guppies that were still surviving in that tank from when I had my African Featherfin Knife in the tank (he's now in a 100 gallon).
I'm going to try him out with frozen bloodworms tonight. I saw him eat some at the LFS
so I'm hoping he'll keep up the good behavior.