I had a Kolsch that didn't drop krausen after 3 weeks. I've heard that cold crashing it will help it to clear and drop, but I didn't try it. I just racked underneath the foam into secondary, since my 5 gallon carboy fits in the fridge for cold conditioning time.
Primary #1:Empty #2:Empty
Secondary #1: Peach Rhubarb Wine #2: Big 50 Barleywine #3: Umlaut my Kölsch V #4: Sparkling Elderflower Wine
Kegged: Piker Liker Porter
Bottles: Framboise Lambic, Red Rye IPA, Dark Belgian Strong, Belgian Golden Strong, Kicked by a Moose Scotch Ale, Apfelwein, Russian Imperial Stout, Carmelite Tripel, Rhubarb Wine, Barolo Wine
On Deck: Dunkel, Irish Red, Surly Bender clone, Spruced Warmer, CDA