I can second that info about them hiding.
Provide them with sand not sharp gravel, and plenty of plants - mine also have a plastic snake hide (hidden tastefully behind bogwood and plants), and they never bury themselves now as there is no need for them to do so. Its just an emergency escape behaviour, not an every day thing so as long as the tank has plenty of natural shelter from plants etc, they will be visible.
They wont take pellets or flake ever, but will take bloodworm etc, live or frozen and mosto people have managed to get them to take a variety of frozen foods.
It IS possible that other fish can outcompete them for food so be careful of this happening, if you think it is, then put the food straight to thebottom near the eel with a turkey baster.
Hth
Em