why is my christmas cactus leaves turning red

Oh dear! It sounds like your Christmas cactus is exhibiting signs of stress. This could be due to a variety of factors such as insufficient sunlight, inconsistent watering, or even a change in temperature or humidity. To address this issue, I recommend ensuring that your cactus is receiving adequate sunlight for at least 6-8 hours per day, and to water it regularly but not excessively. Additionally, you may want to consider adjusting the temperature and humidity levels in your home to more closely match its preferred environment.