I suggest just give it a try and you can decide for yourself eventually as they mature. I never really kept a TireTrack Eel but read about a guy with a 34" Tire Track from another forum. Theyre very flexible, just Im not sure having that size fish in a 4ft tank is a good idea.
Im that type of guy that will get the type of fish I want even when my tank is not big enough for a full grown and will figure out something later
thats why I went from a 4ft to 6ft tank for my Datnoid. You might do the same eventually as you get more attached to your fish. Of course the Bigger the tank the better. IME its better to get the fish that you want rather than an alternative, in my case I know my LFS will take it back or I'll get a bigger tank if the its worth it. I did the latter