The air lock is unnecessary because you would want the yeast to have access to fresh oxygen to reproduce. Simply covering the opening loosely with aluminum foil will work.
In addition, you don't want to put your starter in the fridge. The lower temperatures will slow the yeast down and eventually make them dormant.
By looking at the picture of your starter, I think I can see a thin layer of yeast at the bottom (the white layer on top of the trub).
The purpose of a starter is to create a large population of healthy yeast. The best way to do this is to essentially make a mini-beer. Your starter should be at temperature required for the yeast (around room temp, 65F-74F, but it may vary depending on what type of yeast you are using) and away from sunlight. If you don't have a stirplate, give the starter a good swirl a few times a day to introduce fresh oxygen and roust the yeast back into suspension, giving them a chance to reproduce.
Take the lid off and cover with aluminum foil, give it a good swirl and it will be ready to go in 24-48 hours.
The yeast supplement should go into the wort, added towards the end of the boil.
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On Deck: Peanut Butter Stout (experimental), Honey or Mead Porter, Belgian Noel, IPA, Hefeweizen, American Pale Ale
Primary: English Mild, Dunkleweizen
Secondary: Russian Imperial Stout
Aging in bottle:
Drinking: Apfelwein
Last edited by Jenks829; 10-23-2009 at 05:19 PM.
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