Question about Snowflake Eel

[bubblepuffer]

Hi, I see some good deal on a Snowflake Eel .. are those thing aggreasive? I am thinking of getting one but it will end up in a puffer's tank. I got Porcupine puffer,.. soon it will be together with a green spot when I got my 250g Reef tank ready, then will get Dog face in there too.. I am thinking putting the Porcupine and Snowflake Eel together right now if I am going to get 1, but afraid my Snowflake Eel beat up my Porcupine.. he is a chicken.