First off, that eel grows extrodinarilly fast and needs at least a 180 to house it for a good part of its life. Granted, eels arent very active, but this is the exception. This thing could get 8' long. As far as lights are concerned, I feel that any type of regular lighting would be sufficient. Reef lights or VHOs would definately damage it s nocturnal vision. Stay away from these. If you want a definate answer, ask polarpooch or GKP, they have one.