Have 2' zebra eel, can I add a snowflake eel to tank?

[drgmeh]

I have a 2' zebra moray eel. I would like to ad a snowflake eel. The zebra doesn't bother anything in my tank, not even my small clowns. Is it possible or is he likely to kill another eel ? The biggest snowflake I can find so far is 12"

 

[Ellabug]

What size tank do you have? How much rock do you have?

 

[drgmeh]

I have a 4' 120 gallon with a 30 gallon sump

 

[drgmeh]

I have 120# of tonga branching rock.