I've had 2 of these for about 8-9months now, but not in my planted tank. I moved them over a couple of days ago (after co2 shutoff), and their behaviour has been abnormal. Doesn't look like they cope with the CO2 too well. Usually they've been hiding most of the time and energetic when they move around, but now they're just lying out in the open and moving around slowly. Breathing is very rapid also. They still stick to the wood mostly.
Should I be worried? Does it take more time to adjust to the CO2? (Is it possible to adjust at all?)