Brewed Friday a light wheat beer and used the slurry from a kolsch secondary I had been lagering for 3 weeks as the yeast for it no signs of frementation as of yet (haven't taken a reading yet I know the question is coming). If there is no change in the moring should I just pitch some 05 on it if the reading indicates no change or wait it out. I have never used yeast I have been lagering before on a new batch.
I would definitely pitch some yeast. I've never tried that method either, but I would think that there wouldn't be enough yeast dropping out in the secondary to get a healthy fermentation.
Can't say that for sure, but that's my intuition.