They are not as limber as eels so need enough width to turn and get 167.5 cm long, tank for one at full growth should be at least 180 cm wide and 300 cm long, 1 meter deep would be fine but still that is nearly 4800 liters. I only found one reference to growth rate and it was incomplete, If I read it right 50cm in first year and full growth in just over 5 years but I could be reading this wrong, everything but the numbers is in russian.