Im a newb.. I brew with Kits right now (22Liters)... mix wort with water+ aerate + add yeast done., I have a 2x smack packs- wyeast 2007 Fermenting now( Premium american lager) , I want to finish the primary and start a new batch ( light american lager) the problem is when i mix my wort with water as per instructions I need to aerate well, if i dump over the previous cake im going to be forced to mix up the cake, Is this ok? AND is that cake going to be enough to ferment a new batch all at around 9-12 degrees C.