FluidTank output should be the same as Container output (At least output in kg)

[hot wigeon]

I mean something like .O2{951}.H2{17} to be consistent with the Container Output (At least output kg not fill level)

Both / all three options on diffrent channles would also be fine.

[slender saddle]

In the meantime you can approximate this using constants for full-weight and tracking flow through the pump