What size is it? (this rules out a few species to start with).
I aggree it has some of the same markings of armatus (like the X type markings along its flanks and its colours) but some other things look differant...Tyre Tracks are common too so its like to be one of those. Do you have a 180g ready?
not my eel, its from somebody looking to swap fish. I agree most likely somesort of tyre track eel but the markings don't look like the common ones to me
oh and it's currently about 3-4 inches head to tail