I'm trying to get a yeast harvest from a Sierra Nevada Pale Ale. This is my first time attempting something like this.
I boiled about 1/3 cup LME in a pint of water, let it cool to room temperature Sanitized a quart mason jar and added the wort, then drained the bottom sludge from 3 bottles of the PA. I covered the jar with plastic wrap and let it sit at room temperature. The original "head" on top of the wort went away after a couple days, then a small layer of white bubbles showed up on top of the wort.
It's been sitting at about 68 degrees for 6 days or so.
So my question is: now what? Am I right so far? How do I tell if this is any good? Am I going to be dumping a cesspool of bacteria into my full batch? I didn't get an OG reading, but can probably get a calculated estimation. I've heard the term "decant" with this process, how much should I be pouring off the top?