thank you for your answer and sorry for my late answer.
My BCG grows very slowly in Sauton's medium, it did not change its form under the microscope, but I still want it to grow faster.
I use normal air to bubble it. Do you think using pure oxygen could help speed its growth rate?
Do you know if addition of glucose (2 gr per liter) to the medium could help? I ask because it spouse to be acid fast bacteria and therefor can not consume sugars.