Snowflake eel without a doubt! But you want something more vicious-looking, then Fimbriatus eel might be a good choice. It's got an attractive yellow coloration arounf its jaw. It's pretty mild-tempered, compared to other members of the genus. Chestnut is also a good choice, but I haven't seen one for sale for a long time. But, you see one available, go for it!! I believe wolf eel is not a true eel, but more closely related to the pseudochromis family. but still look like an eel...