Soft thick substrate is a must. I use pool filter sand. They love to burrow. They also like other hiding places, rocks, caves and plants. Seal your tank, mine has climbed into my aquaclears twice this week. If you dont have an aquaclear i'd suggest one. the was it is designed it is almost impossible for the eel to get into the impeller. I had an emperor 400 on this tank but switched when he got into the impeller assembly andI had to break it to free him.
Mine eats brine shrimp and krill. Sometimes he will take the krill from my hand. Becareful, they are called spiny eels for a reason, I stabbed my fingers on his tail getting him out of my filter the other night.