I bought an eel two days ago and think I may have gotten a monster to be. I bought the eel because it had a different pattern than most of the eels that I have seen but upon having it in my own tanks I think it is a tire track eel.
It is a Mastacembelus favus, so it won't get really big (like its close relative, M. armatus). He'll probably top out somewhere between 20 and 28 inches.