Thanks Splifted, I will try the "bag shaker". It sounds like a good solution.

... and about putting the plant in a bag : for a short period of time maybe but not in a long time. The air in a bag will be wery moist (my plant produced 1,5 dl water pr day) and the smell is just a part of a lot of shit the plant want to get rid off thru the blades. You may also have problem with fungus and other deceases.

Then again U can add CO2 over short periods:thumbsup: