The leaves on this plant are just starting to brown. I'm treating it like a mag deficiency because I tend to see that in plants I grow supplementing with Fox Farm nuts, and hopefully I'll see some improvement. It's also gotten quite a bit colder in the tend this week, so it's possible that is creating some stress too.
@BioBuds, thanks for the tip! The plants are all on their own schedules, for better or for worse...I check them in the morning and water the ones that are quite dry. It's more important than ever that they dry out now that the temperatures are lower.