From what I have read I would say no. Two puffers in a 30 gallon tank that is heavily planted can sometimes work but will most of the time not since they are so territorial and a single one should have about 30 gallons once fully grown.
Now the other problem is the ell. A real Snowflake Moray eel will not live in a brackish tank for long. If you really have a Snowflake Moray eel, I don't know. But they are completely saltwater. Do you have a picture of it? If it really is a moray eel, it will get to 3 feet long which will need at least a 75 gallon tank from what I have read.
Here is a good article:
http://saltaquarium.about.com/cs/eel...a/aa082901.htm
Hope this was not too late.