Here's what it looked like.
I would have loved to instrument the can, but O2 sensors are expensive. I'm letting it go for 3 days and keeping it covered with towels to limit the amount of photosynthesis going on. Finally, I'm shopping around for a decent USB camera eyepiece for my microscope so I can share what I see with you. I took a video of the candles burning out, but it turned out very badly and no amount of editing helped. It's all a learning process.