Of these, it reacts to over watering and underwatering the worse. Low light is bad as well, if you do take it inside make sure it gets enough light, also, make sure the temp. Never had a problem with any pests, etc. I have a few comments about Serrias. I am not exactly sure which species I have, both produce white flowers while one is verigated and the other one is not.
Comments apply to both.
They like water and can stay fairly damp. They will stand 40's okay. Like lots of light. In winter I have them under flouesent light for 12 hours a day. I have them in part shade in summer-no choice.