Lots of questions
Mine are potted in fine fir bark just for drainage. Most of the roots seem to want to grow on outside of pots, but the pots are definitely potbound (remember Adam (Stonedragonfarms) who also grows these, except he grows them cold, stated they must be potbound to do well. I typically try to keep both plants up at 1800 foot-candles, but I noticed when I moved Matsushima down to approx 800 foot candles, the keikis took off and started growing. As for what I do with them, nothing. I got one from Hakuunryu and it did notta for many, many months. I finally threw it away. If any of the others develope, I'll plop them in an envelope and mail to you
Otherwise I'll just trim them off and be done with it. I find them ugly on the plant and I find they don't grow well (well I can't attest to Matsushima, but Hakuunryu didn't do anything but sit there.)