While I did have them I'd like to say for the record keeping things like lions and eels with horses isn't for everyone. Personally unless you've kept both previously with success I wouldn't try mixing them as a first attempt. Especially a snowflake eel and full size lion. Dwarf lions are pretty passive and typically OK, the only eel I'd recommend is the white ribbon eel but I don't have any experience with that golden moray.
But never the less....