There are numerous reasons your succulents may be turning pink or red, and they all have to do with their environment and circumstances at the time of changing. They can turn color if exposed to an excessive amount of sun, if the weather becomes really hot or cold, if the plant is watered too sparingly, if the plant isn't fed well enough, and if the plant is in bad soil (via Succulent Plant Care).
Succulent Plant Care also explains that succulents are meant for harsh conditions, so their color changing is actually a self-preservation mechanism to help them survive; they are always adapting to their environment. Because of this, their color changing is not harmful to the plant whatsoever, and their color can always revert back to green once you've properly diagnosed and corrected the issue, such as not watering it regularly enough.
Have your succulents changed colors? There is plenty of room to experiment with your succulents, such as planting them in different sized pots to see how they adapt.
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