Although kept tesselata eel/others in either 90 or 120G Reef Tank which grew to ~ 30", more or less, eventually had to move (large fish started to disappear) to much much much larger tank. I wouldnt keep such eels or bigger such as green morays, etc, etc, in 70G. Even though they may not move around much in natural biotope but their area of movements/turf in the ocean is lot more than what we can provide such as 70G as they will move around quiet a bit in captivity unless tank is well or should I say "appropriately aquascaped" in large aquarium as in Public Aquarium.
Pics would be nice!