Quote Originally Posted by polyglot View Post
Nitrogen bubbles, not air bubbles. They're there to agitate the bath without oxidising it.

Nitrogen is required only for deep-tank processing where it's used to stir the developer up, keep it uniformly mixed and move the exhausted stuff away from the film to be replaced by fresh stuff. The rotary action of the Jobo accomplishes all that so (assuming you can find chemistry) you can stop worrying about bubbles.
That´s are good news. Thank you.

And what about my other questions?