Good memory!Some older retired members kept the eels in larger tanks, 300g+. Biggest was a 36in + that was seen. The eels were big and thick. Couldn’t see them in a 180g minimum.
@keepinfish had a big eel. Maybe he can share some input.
Yes mine was over 36", he was kept in a 6x3x2.5 tank, i had him little over 10 years i think.