I'm working on my first grow ever, and 4 of my 6 cakes are within a few days of 100% colonization. I plan on dunking after birth to get faster pinning and bigger mushrooms. I'm going to submerge them in tupperware containers in the fridge overnight. Is tap water ok for this? Should I boil it first, or is it ok out of the faucet now that the mycelium has taken over and can dominate most things that would have contaminated it in the beginning? How much of a difference will dunking make in the size of my harvest? I've heard figures as large as 2-3 times as much, is that true?