Well, this was unexpected. The picture above is just over 33 hours after my previous post. It's a little early for me to trust it, since this is after the first feeding. I'll keep feeding it until it gives a consistent rise, but this is a great sign! It's smelling deliciously sour.

Here's what it looked like before the feeding (the morning after my post, T+17hrs):

And then here's the top-down shot about 16 hours later:

Nearly a full doubling, vigorous gas production. Just incredible.

Maybe it's a mistake, but I'll keep feeding it and posting the results.